Which ratio forms a proportion with 20/30?

A. 16/24

B. 10/20

C. 17/51

D. 15/60

The hartford insurance company has hired you to poll a sample of adults about their car purchases. what is wrong with using telephone directories as the polpulation from which the sample?

A box contains 15 yellow, 5 orange, and 15 green tennis balls. If Izzy draws a tennis ball at random out of the box what is the probability that she drew either a green or an orange tennis ball?

A retired couple invested $8000 in bonds. At the end of one year, they received an interest payment of $504. What was the simple interest rate of the bonds? Do NOT round off a decimal answer.

In one week, 215,328 people visit the Grand Canyon. How many hundreds of people visit the canyon in that week?

A true false test has 8 questions. What is the probability of guessing the correct answers to all of the questions?

Eva earned the following test scores in science: 82, 100, 96, 90, 91 Ms. Wade entered the next score as 0 because Eva was absent on test day and hadn't had a chance to make up the test.

Choose one of the factors of x^15 - 64. a. x^5 - 4 b. x^10 - 4x^5 + 16 c. x^10 - 4 d. x^15 + 8x + 16

Proportion n/11 = 40/55

The value of y varies directly with x, and y = 4 when x = 10. find y when x = 1. a.-2.5 b. 2.5 c. 0.4 d.-0.4

The height of a cylinder is 6 inches. The diameter of the circular base of the figure is 10 inches. What is the approximate surface area of the figure? Use 3.14 for π and round to the nearest whole number.