HELP ASAP!!!

The best-selling book Samantha has been waiting for hit the shelves at $21.56. What percent discount was this off the cover price of $26.95?

A. 20%
B. 25%
C. 30%
D. 35%

Answer:

We should use C. 1.25

Step-by-step explanation:

We know that the children's book dimensions are 20 cm x 24 cm

We need to find a scale factor (which is a number) that will turn the dimensions 20 cm x 24 cm ⇒ 25 cm x 30 cm

We can write :

(20 cm) . a = 25 cm

Where ''a'' is the scale factor.

Solving for a :

[tex](20cm).a=25cm\\a=\frac{25cm}{20cm}=1.25 \\a=1.25[/tex]

This result is reasonable because the scale factor won't have units

A scale factor of 1.25 turns 20 cm ⇒ 25 cm

We can use the another dimension to verify :

(24 cm) . a = 30 cm

(24 cm) . (1.25) = 30 cm

30 cm = 30 cm

The scale factor is option C. 1.25

Answer:

d. 20

Step-by-step explanation:

Replace the x and y values in the equation

(y = 0.5x + 10) to (x = 0.5y + 10)

Now, solve for the y value in the new equation. You'll get y = 2x + 20.

So, the intercept of the inverse function is 20.

To optimize the dimensions of a rectangle with an area of 32 square cm such that the distance from one corner to the midpoint of a non-adjacent edge is minimized, one must use the Pythagorean theorem and calculus. The minimum distance occurs when the rectangle is a square with sides measuring 4√2 cm.

Assume the rectangle's dimensions are length L and width W, with the given area 32 cm2 such that LW = 32. To minimize the distance (D) from one corner to the midpoint of the non-adjacent edge, we can use the Pythagorean theorem, given by D = √(L2 + (W/2)²).

Since the area is fixed, W can be expressed as 32/L, and we can write D as a function of L. After substituting 32/L for W and differentiating with respect to L, we can find the minimum by setting the derivative equal to zero and solving for L.

The minimum distance is achieved when the rectangle is a square, with length and width both equal to √32, which simplifies to 4√2 cm, which is approximately 5.66 cm for both dimensions.

Answer:

[tex]x=\frac{-2\pm \sqrt{(2)^{2}-4(4)(-1)}}{2(4)}[/tex] is the answer.

Step-by-step explanation:

Given quadratic equation is 4x²+ 2x - 1 = 0

To find the solution of the equation we use the quadratic formula

[tex]x=\frac{-b\pm \sqrt{b^{2}-4ac}}{2a}[/tex]

Now we put the values of a = 4, b = 2 and c = (-1)

Therefore, quadratic formula for the equation given will be

[tex]x=\frac{-2\pm \sqrt{(2)^{2}-4(4)(-1)}}{2(4)}[/tex]

Sam and Jesse wash a total of 70 cars over two days, by washing five cars each hour for seven hours each day.

Sam and Jesse work together to wash cars. They can wash five cars each hour, and they work for seven hours each day. Since they do this over the course of two days, we need to calculate the total number of cars they wash in this period.

First, we find out how many cars they can wash in one day by multiplying the number of cars they can wash in an hour by the number of hours they work:

Next, since they work for two days, we multiply the number of cars washed in one day by two:

Sam and Jesse wash a total of 70 cars over the two days.

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The total comes to $37.67, so the closest answer is (b) $37.68.

We will calculate how much Zalia paid for her day at the science museum including admission fees, lunch, and the tax and tip for both of these.

Firstly, let's calculate the total cost of admission for Zalia and her friend:

Admission for one person: $12.50

Admission for two people: $12.50 x 2 = $25.00

Now, let's find the total cost of Zalia's lunch:

Sandwich cost: $5.95

Apple cost: $1.25

Drink cost: $1.69

Total lunch cost before tax and tip: $5.95 + $1.25 + $1.69 = $8.89

Next, we add the tax:

Tax for admission: $25.00 x 7.25% = $1.81

Tax for lunch: $8.89 x 7.25% = $0.64

Total tax: $1.81 + $0.64 = $2.45

Now, we calculate the tip for the lunch:

Tip: $8.89 x 15% = $1.33

Finally, add everything up to get the total amount Zalia paid:

Total cost without tax and tip: $25.00 + $8.89 = $33.89

Total tax and tip: $2.45 + $1.33 = $3.78

Grand total: $33.89 + $3.78 = $37.67

Examining the provided options, we can see that the closest amount to our calculation is $37.68, considering the possibility of a rounding difference in the final tax and tip calculations. Thus, the correct answer is (b) $37.68.

The set of all real numbers n that are less than -3 can be represented as: [tex]\[ \{ n \mid n < -3 \} \][/tex]

The set of real numbers less than -3 encompasses an infinite range of values extending to the left of -3 on the number line. These numbers are characterized by being smaller than -3, denoted as ( n < -3 ). In interval notation, this set is represented as (-∞, -3), indicating that it includes all real numbers from negative infinity up to, but not including, -3.

This set is unbounded, as there is no limit to how far left the numbers extend, encompassing an infinite continuum of values that are progressively smaller than -3.

To convert from pounds to ounces, multiply the number of pounds by the unit equivalence of 1 pound = 16 ounces.

Conversion from pounds to ounces:

First, find the unit equivalence: 1 pound = 16 ounces.

Next, multiply the number of pounds by the unit equivalence. Thus, 5 pounds x 16 equals 80 ounces.

Invest in more than one type of investment.

Answer:  The required sum of first terms of the series is [tex]\dfrac{1705}{64}.[/tex]

Step-by-step explanation:  We are given to find the sum of the first five terms of a geometric series with first term and common ratio as follows :

[tex]a_1=20~~~~~\textup{and}~~~~~r=\dfrac{1}{4}.[/tex]

We know that

the sum of first n terms of a geometric series with first term [tex]a_1[/tex] and common ratio r is given by

[tex]S_n=\dfrac{a(1-r^n)}{1-r}.[/tex]

Therefore, the sum of first 5 terms of the given geometric series is given by

[tex]S_5\\\\\\=\dfrac{a(1-r^5)}{1-r}\\\\\\=\dfrac{20(1-(\frac{1}{4})^5)}{1-\frac{1}{4}}\\\\\\=\dfrac{20\left(1-\frac{1}{1024}\right)}{\frac{3}{4}}\\\\\\=20\times\dfrac{4}{3}\times\dfrac{1023}{1024}\\\\\\=20\times\dfrac{341}{256}\\\\\\=\dfrac{5\times 341}{64}\\\\\\=\dfrac{1705}{64}.[/tex]

Thus, the required sum of first terms of the given geometric series is [tex]\dfrac{1705}{64}.[/tex]

Three equivalent fractions for [tex]\( \frac{80}{100} \) are \( \frac{4}{5} \), \( \frac{160}{200} \), and \( \frac{400}{500} \)[/tex].

To find three equivalent fractions for [tex]\( \frac{80}{100} \)[/tex], we can simplify the fraction by dividing both the numerator and denominator by their greatest common divisor (GCD), which is 20 in this case.

1. Divide both the numerator and denominator by 20:

[tex]\[ \frac{80 \div 20}{100 \div 20} = \frac{4}{5} \][/tex]

So, [tex]\( \frac{80}{100} \)[/tex] is equivalent to [tex]\( \frac{4}{5} \)[/tex].

2. Multiply both the numerator and denominator by the same non-zero integer:

[tex]\[ \frac{80 \times 2}{100 \times 2} = \frac{160}{200} \][/tex]

So, [tex]\( \frac{80}{100} \) is also equivalent to \( \frac{160}{200} \)[/tex].

3. Similarly, we can multiply both the numerator and denominator by another non-zero integer:

[tex]\[ \frac{80 \times 5}{100 \times 5} = \frac{400}{500} \][/tex]

So, [tex]\( \frac{80}{100} \) is also equivalent to \( \frac{400}{500} \)[/tex].

Tarriq must use "2" as the Multiplication Property of equality.

The Multiplication Property of Equality for any numbers a, b, and c, If we multiply both sides of an equation by the identical number, we always have equivalency.

Rearrange unfamiliar terms to the left side of the equation then

2x = -190 - 50

Calculate the sum or difference

2x = -240

Divide both sides of the equation by the coefficient of variable 2, and we get

x = -240 [tex]$ \div[/tex] 2

Calculate the product or quotient then we get

x = -120

Therefore, the correct answer is option D) 2.

To learn more about Multiplication Property of equality

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Tarriq must use factor C) 1/2, as this represents dividing both sides of the equation by 2 to isolate x, resulting in x = –120.

To finish solving the equation 2x = –240 using the multiplication property of equality, Tarriq must divide both sides of the equation by 2, which is the coefficient of x.

This step can be shown as:

2x / 2 = –240 / 2

The division property of equality allows us to simplify by canceling out the 2s on the left, resulting in:

x = –240 / 2

Therefore, x equals:

x = –120

This shows that the factor Tarriq must use to finish solving the equation is C) 1/2 since that represents the inverse operation of multiplying by 2.

Answer:

b: 22

Step-by-step explanation:

The new ratio of Elena’s hair ties to Melanie’s hair ties is 8 : 3.

Given that Elena has 32 hair ties and Melanie has 8 hair ties, let’s analyze the situation:

Initial Ratio:

The ratio of Elena’s hair ties to Melanie’s hair ties is: [ \text{Elena : Melanie} = 32 : 8 = 4 : 1 ]

Melanie Gets 4 More Hair Ties:

After Melanie receives 4 additional hair ties, her total becomes: [ \text{Melanie’s new total} = 8 + 4 = 12 ]

New Ratio:

Now, let’s find the new ratio of Elena’s hair ties to Melanie’s hair ties: [ \text{Elena : Melanie} = 32 : 12 = 8 : 3 ]

Therefore, the new ratio of Elena’s hair ties to Melanie’s hair ties is 8 : 3.

Complete question:

Elena has 32 hair ties. Melanie has 8 hair ties. The ratio of Elena’s hair ties to Melanie’s hair ties is : 1. If, Melanie gets 4 more hair ties, the new ratio of Elena’s hair ties to Melanie’s hair ties is 8 :

Answer:

D) 15

Step-by-step explanation:

The value of the function f(x) = 5x + 40 at x = -5 will be 15. Then the correct option is D.

A statement, principle, or policy that creates the link between two variables is known as a function. Functions are found all across mathematics and are required for the creation of complex relationships.

The function is given below.

f(x) = 5x + 40

The value of the function f(x) = 5x + 40 at x = -5, then the value of the function will be

f(-5) = 5 (-5) + 40

f(-5) = - 25 + 40

f(-5) = 15

Then the value of the function f(x) = 5x + 40 at x = -5 will be 15.

Then the correct option is D.

More about the function link is given below.

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The correct answer is that there are 2000 people in the school.

To solve this problem, we can set up a proportion based on the information given. We know that 9% of the school's population is in the band, and the band has 180 members. We want to find the total population of the school, which we will denote as [tex]\( P \)[/tex].

The proportion can be written as:

[tex]\[ \frac{9}{100} = \frac{180}{P} \][/tex]

Now, we can solve for [tex]\( P \)[/tex] by cross-multiplying:

[tex]\[ 9P = 180 \times 100 \][/tex]

Divide both sides by 9 to isolate [tex]\( P \)[/tex]:

[tex]\[ P = \frac{180 \times 100}{9} \][/tex]

Simplify the right side of the equation:

[tex]\[ P = \frac{18000}{9} \][/tex]

[tex]\[ P = 2000 \][/tex]

Therefore, the total population of the school is 2000 people. This matches the correct answer given in the options.