The equation y=1.2x+8.9 is a linear model for data comparing the ages of babies between 1 and 11 months old (x) and their average weights in pounds (y). About how much weight does a baby gain per month?

The number 112,300 written in word form is 'one hundred twelve thousand three hundred'.

To write the number 112,300 in word form, you would write it as one hundred twelve thousand three hundred.

When writing numbers in word form, it's important to break them down into their place values and then use conjunctions such as 'and' where appropriate, typically between the hundreds and smaller units. In this case, there are no smaller units, so 'and' isn't used. Instead, we clearly express each place value starting from the highest, which is the hundred thousands, followed by the thousands, then hundreds, tens, and ones, though here the tens and ones places are zero and do not need to be included in the word form.

Using the exponential decay function for Pacific halibut, it is calculated that approximately 24.7% of the original cohort is still alive after 7 years.

To approximate the percentage of the original number of Pacific halibut still alive after 7 years, we use the exponential decay model provided, N(t) = N0e^-0.2t. Plugging in t = 7 years into the equation gives us:

N(7) = N0e^-0.2(7) = N0e^-1.4.

To find this percentage, we can multiply the value of e^-1.4 by 100%. First, we calculate e^-1.4 approximately using a calculator:

e^-1.4 ≈ 0.24660

Multiplying by 100 to get the percentage: 0.24660 × 100% ≈ 24.7%.

Therefore, approximately 24.7% of the original Pacific halibut cohort is still alive after 7 years.

The value of ( x ) is 4.

To find the value of ( x ) in the equation [tex]\( 10(x + 2) = 5(x + 8) \)[/tex], we'll follow these steps:

[tex]\[ 10(x + 2) = 5(x + 8) \][/tex]

[tex]\[ 10x + 20 = 5x + 40 \][/tex]

[tex]\[ 10x - 5x + 20 = 5x - 5x + 40 \][/tex]

[tex]\[ 5x + 20 = 40 \][/tex]

[tex]\[ 5x + 20 - 20 = 40 - 20 \][/tex]

[tex]\[ 5x = 20 \][/tex]

[tex]\[ \frac{5x}{5} = \frac{20}{5} \][/tex]

[tex]\[ x = 4 \][/tex]

Therefore, [tex]\( x = 4 \)[/tex] is the solution.

Answer:

[tex]3(k+d)[/tex]

Step-by-step explanation:

We have been given a sentence. We are supposed to represent our given statement as an expression.

Sentence:

3 times the sum of k and d.

We know that we can find sum of k and d by adding them as shown:

[tex]k+d[/tex]

Since 3 is multiplied to sum of k and d, so sum of k and d will be inside parenthesis.

[tex]3(k+d)[/tex]

Therefore, our required algebraic expression would be [tex]3(k+d)[/tex].

Answer:

743.41 feet.

Step-by-step explanation:

In this question it is given that height of the tower OS is 175 feet and angle of depression ∠ASB = 13°15'

angle of depression to the boat B will be equal to the angle of elevation "∠B"

Now  ∠ASB = 13°15' ≈ 13° + [tex](\frac{15}{60})[/tex]°

= 13° + (0.25)°

= 13.25°

Now tan ∠B = [tex]\frac{SO}{OB}[/tex]

 tan (13.25) =  [tex]\frac{175}{x}[/tex]

            x     =  [tex]\frac{175}{0.2354}[/tex]

                   = 743.41 feet.

Motorboat is 743.41 feet far from the shore.

Answer: 5

Step-by-step explanation:

Lim x-> a (ax+b)/x+c = a you know that a=2

Since the limit of x ->-3 equals infinity, you know that x =3.

Thus a+c = 5

Answer with explanation:

In the problem , given about triangle, four angles are given , r,x ,y and z.

→→One of the three, must be exterior angle of triangle ABC, and other three, must be interior angles of Δ ABC.

So, two properties of triangle that we will use in this problem

1. Angle sum property of triangle: the sum of three angles of triangle is 180°.

2.Exterior angle property: Exterior angle of a triangle is equal to sum of two interior opposite angles.

So, if x, y and z are interior angles , and r is exterior angle

then

Option 3: x + y + z = 180° is always true.

either, r= y + z

and ,r +x=180°

Given that tan(x) is -12/5 in Quadrant II where sin is positive and cos is negative, we can use the Pythagorean theorem to find sin(x) and cos(x), which are then used to calculate sin(2x), cos(2x), and tan(2x).

Given tan(x) = -12/5, x is in Quadrant II. Since tangent is negative in Quadrant II, we know that sin(x) is positive and cos(x) is negative. Using Pythagorean theorem, we can find sin(x) and cos(x). sin(x) = sqrt(1 - cos²(x)) and cos(x) = -sqrt(1-sin²(x)).

The values for sin(x) and cos(x) can then be plugged into the formulas sin2x = 2sin(x) cos(x), cos2x = cos²(x)-sin²(x) and tan2x = sin2x / cos2x to find sin(2x), cos(2x), and tan(2x).

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The simplification of the mathematical expression 12^log base 12 of 144 is 144, according to the properties of logarithms.

To simplify 12^log base 12 of 144, you need to understand the definition of logarithms. A logarithms in base b of a number x is the power to which we have to raise b to get x. In other words, if y = log base b of x, then b^y = x.

Applying this to our example, since log base 12 of 144 is 2 (because 12^2 = 144), then 12^log base 12 of 144 = 12^2 = 144.

Therefore, the simplification of the expression 12^log base 12 of 144 is 144.

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To simplify the expression 12^log base 12 of 144, evaluate the logarithm, substitute the value back into the expression, and perform exponentiation.

In essence, the logarithm with base 12 and argument 144 essentially asks, "To what power must 12 be raised to obtain 144?" The answer, as established, is 2. Consequently, when we raise 12 to the power of 2, we retrieve the original value of 144. This simplification showcases the inherent relationship between logarithms and exponentiation, providing a clearer understanding of the expression's evaluation.

To simplify the expression 12^log12(144), we need to evaluate the logarithm first. Since the base of the logarithm is the same as the base of the exponentiation, we can simplify it to just log(144). Using a calculator, we find that log(144) = 2.158. Now we can substitute this value back into the original expression: 12^2.158. Evaluating the exponentiation gives us the final answer: 205.08.

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Answer:

5

Step-by-step explanation:

Answer:

C- x=y^2-7

Step-by-step explanation:

To find the inverse of the function you can just exchange the name of the variables, change x for y and y for x..

original (direct) function: y = x^2 - 7

inverse function x = y^2 - 7

Then, the answer is the option c.

To find the z-score that satisfies the condition of 20% of the total area being to the left of z, use the z-table to locate the closest area to 0.20 and its corresponding z-score.

To find the z-score that satisfies the condition of 20% of the total area being to the left of z, you can use the z-table. First, locate the area in the table that is closest to 0.20, which is 0.1995.

The corresponding z-score is approximately -0.85.

Therefore, the z-score that best satisfies the condition is -0.85.

To calculate the value of f(-2), a function definition f(x) is required. The information provided does not include this, making it impossible to determine the value of f(-2) without further details.

In the context given, it appears that the question f(-2) refers to finding the value of a function f when the variable is -2. However, the provided information does not include a function or formula for f(x) that can be evaluated at x = -2. The details given seem to be related to various mathematical and scientific principles such as lens formula, chemical reactions, and quadratic equations, but none of these can be directly linked to a function f(x) to evaluate f(-2). To answer the question about the value of f(-2), the explicit function definition f(x) is necessary. Without this definition, it is impossible to determine the value of f(-2).

The value of f(2) for the function f(x) = 2x^2+1 is 9. This is calculated by substituting '2' into the function, squaring it, multiplying by 2, and then adding 1.

To find the value of f(2) for the function f(x) = 2x^2+1, you simply substitute '2' for every instance of 'x' in the function's formula. Here's the step-by-step calculation:
Replace 'x' with '2': 2(2)^2 + 1

Multiply '2' by '4': 8 + 1
Add '1' to '8': 9
Therefore, the value of f(2) is 9.
The probable question maybe:
What is the value of f(2) if f(x) = 2x^2+1?