Construct and interpret a 95% confidence interval estimate for the difference in the mean number of cell phone calls per month for 18-24-year-olds and 45-54-year-olds.

What is 85 percent as a decimal and fraction

While at the beach, Shari and Alicia build a sand castle. Shari estimates that there are 6 x 10^15 grains of sand used to contruct the sand castle, while Alicia estimates that there are 2 x 10^12 grains of sand in the sand castle.

3 different complex fractions that are equal to 1/2

A pro-athlete is offered an eight-year contract with a starting salary of $400,000. She will receive an annual increase of 5% for meeting certain goals.

A school spent $900 on new desk for the start of the year. that amount included a 6% sales tax. what was the original price of the desk. before tax

How many triangles can you draw which have one side of length 4 cm, one side of length 7 cm, and one side of length 12 cm?

Multiply and simplify: 10x (9x^2 + 6x + 7)

B ∩ U A = U (B ∩ A).

Kylee bought a pack of 12 cookies. one-third if the cookies are peanut butter. How many of the cookies in the pack are peanut butter?

How do you know the opposite of a nonzero integer?