I have to subtract fractions

Let n = 5. What is the value of the expression 9n^2 - 2-n?

Evaluate f (x) = 1/4x for x = - 5

A cylindrical vase has a diameter of 6 inches. At the bottom of the vase, there are 9 marbles, each of diameter 3 inches. The vase is filled with water up to a height of 12 inches.

Itmar is 63 in tall in August and grows one half each moth through may how tall is he

Which of the following are proper units for measuring distance in the US System? Check all that apply. A. centimeter B. inch C. foot D. millimeter

You deposit $1240 in a savings account paying 4.2% interest. How much interest will you earn in six years

Were only 64 seats. The remaining 6 students had to travel in a separate van. The equation 2b + 6 = 70 represents the given scenario.

The lengths of plate glass parts are measured to the nearest tenth of a millimeter. the lengths are uniformly distributed with values at every tenth of a millimeter starting at 590.2, and continuing through 590.8.

How do you subtract o. 8 from 1.5

Four times a number decreased by 25 is the same as 9 times the number. Find the number.