Exam 1: Introduction to Real Numbers and Algebraic Expressions

State the real number that corresponds to the situation. -One country exported $74,800,000 less than it imported, giving it a negative trade balance.

Multiply. - $\left( - \frac { 5 } { 9 } \right) \left( - \frac { 5 } { 9 } \right)$

Evaluate -x for the given value of x. -x = -3.04

Write an equivalent expression. Use an associative law. -(5s)t

Multiply. --0.3 · (-15.3)

Remove parentheses and simplify. -6x - (7 - 2x)

Add. Do not use a number line except as a check. - $- \frac { 3 } { 5 } + \frac { 7 } { 15 }$

Find the opposite, or additive inverse. --22

Add. Do not use a number line except as a check. -5 + -5

Multiply. - $5 ( 6 r + 9 + 6 s )$

Write an equivalent expression. Use an associative law. -(3x)y

Translate the phrase to an algebraic expression. -The sum of x and y

Divide. --4.5 ÷ 0.09

Translate to an algebraic expression. -Robbie drove his car at 50 mph for x hours. How many miles did he travel?

Evaluate. - $\frac { 7 x + 7 y } { 7 }$ , when $x = 42$ and $y = 21$

Subtract. --0.42 - 4

Translate to an algebraic expression. -Leanne had $21 remaining after paying y dollars for a dinner and a movie. How much did she have at the start of the evening?

Find the reciprocal, if it exists. - $\frac { 4 x } { 5 y }$

Find the reciprocal, if it exists. --2.7

Find the reciprocal, if it exists. - $\frac { 1 } { 7 x }$