The number of bacteria in a culture is increasing according to the law of exponential growth. after 2 hours, there are 50 bacteria, and after 4 hours, there are 200 bacteria. how many bacteria will there be after 7 hours?
A florist is making blue and white flower arrangements. For the arrangements, he places a red ribbon on every 3rd arrangement and a blue ribbon on every 5th arrangement. Which arrangement will be the first to have a red ribbon and a blue ribbon?
Simplify the expression (x^19 y^21)^4/(x^2 y^6)^2
The simplified expression is ________.
*PLEASE HELP* Compute the amount of interest earned in the following simple interest problem. Explain how you got it please
A deposit of $5,500 at 6% for 3 years
The amount of interest earned is $990 when we deposit of $5,500 at 6% for 3 years
What is Percentage?percentage, a relative value indicating hundredth parts of any quantity.
We have to find the amount of interest earned
The deposited amount or principal amount us 5500
Rate of interest is 6% and time is 3 years
The formula for simple interest is I=PRT
I = interest, P = principal, R = rate, T = time in years.
Let us convert 6% to decimal form
Divide 6 by 100
6%=0.06
I = 5500(0.06)(3)
I = $990
Hence, the amount of interest earned is $990 when we deposit of $5,500 at 6% for 3 years
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Rick, Maya, and Tom work in a call center. On a particular day, Rick worked 5 and ½ hours, Maya worked 6.1 hours, and Tom worked 6 hours and 30 minutes. What is the total number of minutes that they worked?
Rick, Maya, and Tom worked a total of 1086 minutes.
To calculate this:
1. Convert Rick's hours to minutes: 5 hours and ½ hour = [tex]\( 5 \times 60 + 30 = 330 \) minutes.[/tex]
2. Convert Maya's hours to minutes: 6 hours and 1/10 hour = [tex]c\( 6 \times 60 + 6 = 366 \) minutes.[/tex]
3. Convert Tom's hours to minutes: 6 hours and 30 minutes = [tex]\( 6 \times 60 + 30 = 390 \) minutes.[/tex]
Now, add up all the minutes worked:
[tex]\[ 330 + 366 + 390 = 1086 \] minutes.[/tex]
Therefore, Rick, Maya, and Tom worked a total of 1086 minutes.
- Rick worked for 5 hours and ½ hour, which is 330 minutes.
- Maya worked for 6 hours and 1/10 hour, which is 366 minutes.
- Tom worked for 6 hours and 30 minutes, which is 390 minutes.
Adding these minutes together gives a total of 1086 minutes.
complete question
Rick, Maya, and Tom work in a call center. On a particular day, Rick worked 5 and ½ hours, Maya worked 6.1 hours, and Tom worked 6 hours and 30 minutes. What is the total number of minutes that they worked?
Mike and Kate plan to save money for their wedding over a 20 month period. They will need to save $8,000 to help pay for the wedding. They set aside the same amount each month. After a year they saved $4,000. Mike and Kate know they must adjust their plan in order to meet their goal, so they came up with the following options: Option A: Stay with saving the same amount they've been saving each month but postpone the wedding 2 months. Option B: Increase the amount of money they save each month by $80 from what they've been saving. Which of the following is a true statement? a. Only option A will allow them to meet their goal. b. Only option B will allow them to meet their goal. c. Both options A and B will allow them to meet their goal. d. Neither option A nor option B will allow them to meet their goal
To meet their goal of saving $8,000 for their wedding, Mike and Kate need to adjust their plan. Increasing the amount they save each month by $80 (Option B) will allow them to reach their goal.
Explanation:To determine which option will allow Mike and Kate to meet their goal of saving $8,000 for their wedding, we need to analyze the information given. They saved $4,000 in the first year, which means they saved $4,000 in 12 months. To reach their goal, they need to save an additional $4,000 in 8 months.
Option A: If they stay with saving the same amount they've been saving each month, they will save the same amount each month for the remaining 8 months. Therefore, they will not reach their goal of $8,000.
Option B: If they increase the amount they save each month by $80, they will be saving $80 more each month for the remaining 8 months. This will result in them saving an additional $640 ($80 x 8 months) and reaching their goal of $8,000.
Therefore, the correct answer is Option B - Only option B will allow them to meet their goal.
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Graph the function. Upload a handwritten copy of your graph as your final answer.
y={ x for x<0
-x^2 for x≥0
PLEASE ANSWER!
1. Choose the best definition for the following term: exponent
The number listed first when combining a variable and a number
The number or value being raised to a power
A letter that holds the place of some unknown value in mathematics
Shorthand that tells how many times the base is used as a factor, or how many times the base is multiplied by itself
2. Choose the best definition for the following term: variable
A letter that holds the place for some unknown value in mathematics
A process where you must look for terms that have identical variable parts and then combine their coefficients
A process where if two things are equal, one can be put in the place of the other and nothing will change
Terms that have identical variable parts
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Decide which of the two points on the graph of the line
X=0
A. 0,7
B. -4,0
What is the rate of change of the perimeter of the square at the instant the area is 49 m2?
2/3b + 5 = 20 - b
Solve for b
The solution value of b in the equation 2/3b + 5 = 20 - b is: b = 9.
Here, we have,
given that,
the equation is:
2/3b + 5 = 20 - b
so with these equations, you collect 'like terms.'
like terms are basically grouping things that are the same together,
so for example a+a-b+2b would be 2a+b.
with this equation you want to do the same.
2/3b + 5 = 20 - b
first, make all the numbers integers (whole numbers).
we want to make 2/3b a whole number,
so we multiply the whole equation by 3 to keep everything in proportion with each other,
thus ending up with
2b + 15 = 60 - 3b
now we collect 'like terms.'
add 3b to both sides gives
5b + 15 = 60
subtract 15 from both sides
5b = 45
divide by 5 to leave the value of b
b = 9
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NEED HELP PLEASE ANSWER ASAP. Two points have the same Y-coordinates but different X-coordinates. Make a prediction about the slope of a line drawn through the points. Justify your prediction.
The slope of a line drawn through the points are zero.
What is Equation of line?
The equation of line in point-slope form passing through the points
(x₁ , y₁) and (x₂, y₂) with slope m is defined as;
⇒ y - y₁ = m (x - x₁)
Where, m = (y₂ - y₁) / (x₂ - x₁)
Given that;
Two points have the same Y-coordinates but different X-coordinates.
Now,
Since, Two points have the same Y-coordinates but different X-coordinates.
Hence, Take two points as;
(x, y) = (3, 4) , (5, 4)
Thus, The slope of line passing through the points (3, 4) and (5, 4) is,
⇒ m = (4 - 4) / (5 - 3)
⇒ m = 0
Thus, The slope of a line drawn through the points are zero.
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Name two properties used to evaluate 7x1-4x1/4
What is the value of x?
a. 68°
b. 62°
c. 112°
d. 124°
Suppose that a circular coin has an area a, a radius of r, and a diameter of
d. write a as a function of
d.
Area of the given Circle as the function of its diameter πd²/4
What is circle?A Circle is the 2D shape which is measured in the terms of its radius.
Given that Area, radius and diameter of the given Circle is a , r and d respectively.
Area of Circle (A) = π X radius²
radius = diameter/2
Therefore replacing radius by diameter we get,
A = π(d/2)²
A = πd²/4
Hence, Area as a function of d is given by A = πd²/4
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A solid right pyramid has a regular hexagonal base with an area of 7.4 units2. The pyramid has a height of 6 units.
What is the volume of the pyramid?
11.1 units3
14.8 units3
22.2 units3
44.4 units3
Answer:
Option B. 14.8 units³ is the answer.
Step-by-step explanation:
It is given in the question A solid right pyramid which has a regular hexagonal base with area = 7.4 unit²
Height of the pyramid = 6 units.
We have to calculate the volume of the pyramid.
Since volume of the pyramid = (1/3)×Area of the base × height
Volume = (1/3)×7.4×6 = 7.4 × 2 = 14.8 units³
Therefore option B. 14.8 units³ is the answer.
It should be noted that the volume of the pyramid will be 14.8 unit³.
How to calculate the volume of the pyramidFrom the information given, the solid right pyramid has a regular hexagonal base with an area of 7.4 units².
The height of the pyramid is also 6 units. Therefore, the volume of the pyramid will be:
= 1/3 × Area of the base × height
= 1/3 × 7.4 × 6
= 14.8 units³
In conclusion, the volume of the pyramid is 14.8 unit³.
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two segments are ______ coplanar
A.) always
B.) sometimes
C.) never
Two segments are always coplanar. The correct option is A.
What is a line segment?A line segment in geometry is a section of a line that has two clearly defined endpoints and contains every point on the line that lies within its confines.
An adjacent line to another line in the same plane. Any two intersecting lines must be coplanar, that is, they must be on the same plane. Two line segments are always in the same plane.
Straight lines that are parallel and do not intersect at any point are called parallel lines. In the same three-dimensional space, parallel planes are any planes that never cross.
Therefore, the segments are always coplanar. The correct option is A.
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27 is 3 times as many as what number?
A. 9 B. 81 C. 7 D. 24
How many length 6 passwords with 1 number 1 upper and 1 lower?
Worth a brainliest if the answer is correct.
If the rule (x,y) → (x+3, y-3) is applied to the original triangle, give the coordinates of and draw the image. Show your work for calculating the coordinates of the resulting image.
Faith mixes 14 liters of 12% acid solution with a 30% acid solution, which results in an 18% acid solution. let x represent the number of liters of 30% acid solution used, and let y represent the number of liters of mixture. which system of equations can be used to find the number of liters of 30% acid solution in the mixture?
If vx = 7.60 units and vy = -6.60 units, determine the magnitude of v⃗ .
Answer:
|v| = 10.06 units
Step-by-step explanation:
It is given that,
The x component of the vector is, [tex]v_x=7.6\ units[/tex]
The y component of the vector is, [tex]v_y=-6.6\ units[/tex]
We need to find the magnitude of vector v. The magnitude of any vector is calculated as :
[tex]|v|=\sqrt{v_x^2+v_y^2}[/tex]
[tex]|v|=\sqrt{(7.6)^2+(-6.6)^2}[/tex]
|v| = 10.06 units
So, the magnitude of vector v is 10.06 units. Hence, this is the required solution.
1. Write numbers from standard form to Scientific notation for the following: The diameter of human DNA is about 0.000000002
2. Idaho is shaped like a triangle with a base of approximately 320 miles and a height of approximately 520 miles. Calculate the area of Idaho and write the answer in scientific notation.
An investment is currently worth 2.125×104 dollars . Ten years ago, the investment was worth 1.25×103 dollars. How many times greater is the value of the investment today than the value of the investment ten years ago? A 0.17 B 1.7 C 17 D 170
Answer: C. 17
Step-by-step explanation:
Given : An investment is currently worth [tex]2.125\times10^4[/tex] dollars . Ten years ago, the investment was worth [tex]1.25\times10^3[/tex] dollars.
Then, the number of times the value of the investment today is greater than the value of the investment ten years ago is given by :-
[tex]\dfrac{\text{Current investment}}{\text{\text{Yen years ago investment}}}\\\\=\dfrac{2.125\times10^4}{1.25\times10^3}\\\\=\dfrac{2.125}{1.25}\times10^{4-3}\ \ [\because a^m\times a^n=a^{m+n}]\\\\=1.7\times10=17[/tex]
Hence, the value of the investment today is 17 times greater than the value of the investment ten years ago .
A sea turtle swims at a speed of 27 kilometers per hour. A girl swims 14 decimeters per second.
1 m = 10 dm
1000 m = 1 km
How much faster does the sea turtle swim than the girl in meters per minute?
Answer in meter per minute
~~~~~~~~~~The answer is 366 m/min~~~~~~~~~~~~~~~~~~ First, convert the turtles speed to meters per minute. 27 km/h * 1000 m/km = 27000 m/h / 60 min/h = 450 m/min Now convert the girls speed to meters per minute. 14 dm/s / 10 dm/m * 60 s/min = 84 m/min Now subtract the girl's speed from the turtle's speed. 450 m/min = 84 m/min = 366 m/min
If y varies directly as x, and the constant of variation is -3, which equation represents this relationship?
Final answer:
The equation representing a direct variation where y varies directly as x with a constant of variation of -3 is y = -3x. It is a linear equation without a y-intercept.
Explanation:
If y varies directly as x, and the constant of variation is -3, the equation that represents this relationship can be written as y = kx, where k is the constant of variation. Since the constant of variation is given as -3, the equation becomes y = -3x. This is a linear equation similar to the form y = mx + b, where m is the slope of the line and b is the y-intercept. In this case, since the constant of variation is -3, the slope of the line is -3 and the y-intercept is 0 because there is no addition or subtraction of a constant in the equation.
Please help me thank you.
1st question - answer is #2
line P & Q = x=3, Y=5
triangle question, x = 17
PLEASE HELP WITH THESE TWO
4. Tyler is writing a coordinate proof to show that a diagonal of a rectangle divides the rectangle into two triangles that have equal areas. He starts by assigning coordinates to a rectangle. Then he uses these coordinates to write an expression for the area of each triangle formed by the diagonal.
What is the area of one of the triangles formed by the diagonal of the rectangle?
Enter an expression in the box for the area of the triangle.
5. Amira is writing a coordinate proof to show that the area of a triangle created by joining the midpoints of an isosceles triangles is one-fourth the area of the isosceles triangle. She starts by assigning coordinates as given.
Enter your answers, in simplest form, in the boxes to complete the coordinate proof.
Point Q is the midpoint of DE , so the coordinates of point Q are (a, b).
Point R is the midpoint of FE , so the coordinates of point R are ([ ], b).
In ΔDEF , the length of the base, DF , is [ ], and the height is 2b, so its area is [ ].
In ΔQRP , the length of the base, QR , is [ ], and the height is b, so its area is ab.
Comparing the expressions for the areas proves that the area of the triangle created by joining the midpoints of an isosceles triangle is one-fourth the area of the triangle.
Thanks in advance. Please explain.
Answer:
#4) 1/2(ab); #5) 3a, 4a, 4ab, 2a
Step-by-step explanation:
#4) Take the top triangle. The height will be the difference in the y-coordinates of J and M:
b-0 = b
The base of the triangle would be the difference in the x-coordinates of J and K:
a-0 = a
The area is given by the formula A=1/2bh, where b is the base and h is the height; substituting our height and base, we have
A=1/2(b)(a) = 1/2(ab)
#5) To find the midpoint of a section, we add together the x-coordinates and divide by to, and add together the y-coordinates and divide by 2.
The endpoints of FE are (4a, 0) and (2a, 2b). This makes R:
[tex](\frac{2a+4a}{2},\frac{2b+0}{2})\\\\=(\frac{6a}{2},\frac{2b}{2})\\\\=(3a, b)[/tex]
The length of DF can be found by subtracting the x-coordinates:
4a-0 = 4a
The area is then found by multiplying 1/2 by the base and the height:
A=1/2(4a)(2b) = 1/2(8ab) = 4ab
The length of QR can be found by subtracting the x-coordinates:
3a-a = 2a
Does this table represent a function? Why or why not? x:2, 4, 6, 8, 10 y:1, 3, 3, 4, 6 A.No, because two of the y-value are the same. B.Yes, because all of the x-value corresponds to one or more y-values C.Yes, because every x-value corresponds to exactly one y-value. D.No, because one x-value corresponds to two different y-values
Answer:
C.Yes, because every x-value corresponds to exactly one y-value.
Step-by-step explanation:
A function is a relation in which each element of the domain (x) is mapped to one element of the range (y). This means that no x can be mapped to more than one y; basically it means that no x can repeat.
In this table, no x repeats; each x is mapped to only 1 y. This means that it is a function.
Answer:
The correct option is C) Yes, because every x-value corresponds to exactly one y-value.
Step-by-step explanation:
Consider the provided table:
x y
2 1
4 3
6 3
8 4
10 6
A function is a relation from a set of inputs to a set of possible outputs where each input is related to exactly one output.
Or we can say that, a function is a set of ordered pairs in which x element has only one y-element associated with it.
Now observe the table for each x element we have only one y element.
Therefore, the table represent a function.
The correct option is C) Yes, because every x-value corresponds to exactly one y-value.
The gypsy moth is a serious threat to oak and aspen trees. A state agriculture department places traps throughout the state to detect the moths. When traps are checked periodically, the mean number of moths trapped is only 0.6, but some traps have several moths. The distribution of moth counts is discrete and strongly skewed, with standard deviation 0.4.
a. What is the mean (±0.1) of the average number of moths x¯¯¯ (x bar) in 30 traps?
I got 18 by multiplying 30 times 0.6, I'm not confident 100% in this
b. And the standard deviation? (±0.001)
I got 0.073 by doing 0.4/ sqrt of 30...not confident
c. Use the central limit theorem to find the probability (±0.01) that the average number of moths in 30 traps is greater than 0.7:
I got 1.37 by doing 0.7-0.6 / 0.073 (0.4/sqrt of 30)
are these answers correct?
The student's calculations for mean and standard deviation are correct, although the standard deviation was slightly misunderstood. The calculation for the z-score was correct, but the student failed to convert this z-score into a probability.
Explanation:The question discusses certain calculations about the distribution of gypsy moths in traps placed by a state agriculture department. Your calculation for (a), the
mean
number of moths in 30 traps, is correct. We multiply the mean number of moths in one trap (0.6) by the number of traps (30) to obtain 18. However, for (b), the
standard deviation
of the distribution is incorrectly calculated. In fact, as we apply the formula for standard deviation of sample means σ/√n, where σ is the population standard deviation (0.4) and n is the sample size (30), it comes out to be 0.073 (rounded to ±0.001). Lastly, for (c), using the given values in the
central limit theorem
, the z-score calculator gives us a value of 1.37, but remember, this is a z-score, not a probability. To convert the z-score to a probability, you need to consult a standard normal distribution table or use a calculator with a built-in z-score to probability converter.
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