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4 years ago

Identify the explanatory variable and response variable in each of the studies

Mathematics

1 answer:

blondinia [14]4 years ago

8 0

Answer:

Step-by-step explanation:

Answer:

a) Explanatory variable is the study of cell phone usage while the response variable is the risk of brain cancer

b) Explanatory variable is the Records of more than three-quarters of a million surgical procedures conducted at 34 different hospitals, while the response variable is the mortality rate

c) Explanatory variable is the type of treatment given (Salk polio vaccine or a saline placebo injection) while the response variable is the polio rate.

Step-by-step explanation:

Explanatory variable are the variable been studied in a research while the response variable are the effects ( either positive or negative) of the explanatory variable that is studied.

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Which of the following is the product of the rational expression shown below

wolverine [178]

Option C: $\frac{x^{2}-9}{x^{2}-4}$ is the product of the rational expression.

Explanation:

The given rational expression is $\frac{x+3}{x+2} \cdot \frac{x-3}{x-2}$

We need to determine the product of the rational expression.

<u>Product of the rational expression:</u>

Let us multiply the rational expression to determine the product of the rational expression.

Thus, we have;

$\frac{(x+3)(x-3)}{(x+2)(x-2)}$

Let us use the identity $(a+b)(a-b)=a^2-b^2$ in the above expression.

Thus, we get;

$\frac{x^{2} -3^2}{x^{2} -2^2}$

Simplifying the terms, we get;

$\frac{x^{2}-9}{x^{2}-4}$

Thus, the product of the rational expression is $\frac{x^{2}-9}{x^{2}-4}$

Hence, Option C is the correct answer.

6 0

3 years ago

<img src="https://tex.z-dn.net/?f=%5Csqrt%7Bx%7D%2064%2F4" id="TexFormula1" title="\sqrt{x} 64/4" alt="\sqrt{x} 64/4" align="abs

ozzi

Answer: $=16\sqrt{x}$

Step-by-step explanation:

$\sqrt{x}\frac{64}{4}=16\sqrt{x}$

8 0

3 years ago

Find the domain of the function shown. Write the answer in interval notation.

lara31 [8.8K]

( - ∞, 3) ∪ (3, ∞ )

The domain is the set of values of x which make f(x) defined

The denominator of f(x) cannot be zero as this would make f(x) undefined. Equating the denominator to zero and solving gives the value that x cannot be.

solve x - 3 = 0 ⇒ x = 3

domain : (- ∞, 3) ∪ (3, ∞ )

7 0

4 years ago

What is (9+8)/(88+77)

barxatty [35]

Answer:

Exact form: 17/165

Decimal form: 0.103

Step-by-step explanation:

hope this helps :)

3 0

3 years ago

Read 2 more answers

A rock was thrown upward into the air. The height, in meters, of the rock above the ground t seconds after being thrown can be d

leonid [27]

Answedka

Step-by-step explanatio

5 0

3 years ago