91Ó°ÊÓ

Decide whether each of the following is an expression or an equation. If it is an expression, simplify it. If it is an equation, solve it. \(\begin{array}{ll}{\text { (a) } 5 x+8-4 x+7} & {\text { (b) }-6 y+12+7 y-5} \\\ {\text { (c) } 5 x+8-4 x=7} & {\text { (d) }-6 y+12+7 y=-5}\end{array}\)

In your own words, explain what is meant by each term. (a) Perimeter of a plane geometric figure (b) Area of a plane geometric figure

Which pairs of equations are equivalent equations? \(\begin{array}{ll}{\text { A. } x+2=6 \text { and } x=4} & {\text { B. } 10-x=5 \text { and } x=-5} \\ {\text { C. } x+3=9 \text { and } x=6} & {\text { D. } 4+x=8 \text { and } x=-4}\end{array}\)

Which one of the following represents a ratio of 3 days to 2 weeks? A. \(\frac{3}{2}\) B. \(\frac{3}{7}\) C. \(\frac{1.5}{1}\) D. \(\frac{3}{14}\)

Decide whether perimeter or area would be used to solve a problem concerning the measure of the quantity. Sod for a lawn

Write a ratio for each word phrase. Write fractions in lowest terms. See Example 1. 72 dollars to 220 dollars

Solve each equation, and check your solution. $$ x-9=8 $$

Decide whether perimeter or area would be used to solve a problem concerning the measure of the quantity. Fencing for a yard

If 2 is added to five times a number, the result is equal to 5 more than four times the number. Find the number.

If four times a number is added to \(8,\) the result is three times the number, added to \(5 .\) Find the number.