A coach wants to see how long the members of the water polo team can hold their breath. He times each member and finds that the average is 45 seconds. What type of study is this?

Experiment

Observational study

Randomized trial

Double-blind study

The graph of an absolute value function opens up and has a vertex of (0, - 3). The domain of the function is = A. ( - ∞,-3] B.[-3, ∞) C. ( - ∞, ∞) The range of the function is = A. ( - ∞,-3] B.[-3, ∞) C. ( - ∞, ∞)

Simplify this rational expression. 2x^2+5x+3/2x^2-x-3

The ratio of red candies to green candies in a bag is 4/5. witch rail would preform a proportional relationship with the ratio A. 16/25 B. 20/35 C. 20/25 D. 24/32

Find the mean of this set of numbers. 5, - 11, 7, 12, - 1, 0 A. 6 B. 2 C. -2 D. -6

A bus holds 25 students. There are 205 students. How many buses will be needed to transport all the students?

Three groups of schoolchildren receive three different types of reading instruction for a school year. At the end of the year, students reading performance is measured. Identify the independent variable and dependent variable in the study.

Caitlyn needs to solve the equation: 2 (3x+1) = 3 (2-x). after copying the problem correctly she uses the Properties of Algebra to solve for x in 5 steps. There is a reason the justifies each step.

Find the missing term in the following proportion: 2/4 = n/18 A) 2 B) 4 C) 9 D) 18

Estimate the difference of 350.012 and 87.826 to the nearest hundredth. A. 262B. 262.18C. 262.19D. 437.84

A Dog Sled Driver Added More Gear To The Sled Doubling Its Weight This Felt Too Heavy So The Driver Removed 20 Pounds To Reach The Final Weight Of 180 Pounds Write And Solve An Equation To Find The Sleds Original Weight Describe How You Could Find