As a person cycling increases speed, the rate of calories burned, distance traveled, and energy expended also increase. Which of the following is the independent variable?

A. Energy

B. Calories

C. Speed

D. Distance

Answer Explanation:

an independent variable is one that when changed, causes the other variable(s) to change. In our case, calories burned, distance traveled, energy used increase when cycling speed increases.

Therefore, speed is the independent variable while other variables are dependent.

Therefore, the Correct Answer is C.

Q #1: Which of the following is the equivalence in pounds for 50 kg? (2.2 lb =1 kg)

A. 110 lb

B. 220 lb

C. 52.2 lb

D. 22.7 lb

Answer Explanation

We asked to convert kg to pounds. There are two ways of converting between kg and pounds

And

Since we are asked to find pounds, we use the second option for kg to cancel during conversion as follows:

Thus, 50 kg is equal to 110 lb.
Q #2: How may milliliters are there in 0.5 liters?

A. 500

B. 50

C. 5

D. 5000

Answer Explanation

We use 1 L =1000 mL to convert between the two units. The conversion fractions of interconverting are:

And

Since we want to end up with millimeters, the second conversion is used in converting L to mL as:

Thus, 0.5 L is equivalent to 500 mL.
Q #3: A child has collected 50 pennies, 45 nickels, 25 dimes, and 5 quarters. Which of the following charts accurately organizes the number of coins?

A. A

B. B

C. C

D. D

Answer Explanation

In this scenario, we use the given scale in the charts to find the number of each coin and selected the right number of coins the student collected. The second options shows that the child collected 50 pennies, 45 nickels, 25 dimes, and 5 quarters.