91Ó°ÊÓ

Ruth walks at the rate of 100 meters per minute and jogs at the rate of 220 meters per minute. She walks for 25 minutes and then jogs for 35 minutes. (a) How fast does she walk? (b) For how long does she walk? (c) How far does she walk? (d) How fast does she jog? (e) For how long does she jog? (f) How far does she jog? (g) How much distance has Ruth covered all together?

Simplify by combining like terms whenever possible. $$2 x+5 x$$

Using exactly four 3 's and the four arithmetic operations, write an expression for as many of the numbers from 1 through 27 as you can. For example, the number 6 can be written as \(3\left(3-\frac{3}{3}\right)\)

Simplify the given expression as completely as possible. $$\left(-5 n^{4}\right)^{3}$$

Evaluate the given expression for \(x=2, y=-3,\) and \(z=-4.\) $$y^{2}-3 y+2$$

Evaluate each expression. Round off your answer to the nearest thousandth where necessary. $$(-2.7)^{9}$$

Simplify by combining like terms whenever possible. $$5 x+7 x-3$$

Simplify by combining like terms whenever possible. $$18+6 w-w+4$$

Simplify by combining like terms whenever possible. $$2 x-3 y-7 x+5 y$$

Simplify by combining like terms whenever possible. $$3 s-4 t-8 s+t$$