The number of hours per day a college student spends on homework has a mean of 4 hours and a standard deviation of 0.75 hours. yesterday she spent 3 hours on homework. how many standard deviations from the mean is that?

Helen is 8 years older than Jane. Twenty years ago Helen was three times as old as Jane. How old is each now?

Which equation is represented by the phrase "a number increased by three equals 10"? O ELLE x + 3 = 10 3x = 10 x = 10 x + 10 = 3 O

7 (x-4) - 3 (x+5) simplified

The half-life of strontium - 90 is approximately 29 Year's. How much of a 150 g sample of strontium-90 will remain after 116 years

What type of equation is 2 (x+4) = 3+2x

What is 10/9 as a decimal

Suppose that, in an experimental setting, 100 students are asked to choose between Gamble A and Gamble B, where: Gamble A: The student will receive $5,100 with a 70 percent probability and $200 with a 30 percent probability.

Simplify the product - 8 (-9) A. 71 B. 74 C. 72 D. 70

A package of 4 light bulbs costs $12.12. What is the unit price?

Julian is 10 years younger the Thomas. The sum of their ages is 74. What is Thomas's age?