91Ó°ÊÓ

Which property allows you to write?

$4 + (3 +9 )  =  (4 +3)+9$

In Exercises 1–3, evaluate the expression. Justify each of your steps.

Copy and complete: A(n) _?_ of an equation is a number that produces a true statement when it is substituted for the variable.

For the given expression,identify the terms, like terms, coefficients, and constant terms. Then simplify the expression.

$3x+2+5x$

What property is illustrated by the statement: $3(4-9)=  3\left(4\right)  -  3\left(9\right)$?

Copy and complete: The sum of a positive decimal and a negative decimal has the same sign as the decimal with the greater _?_.

Solve the equation. Check your solution.

$1.  x+8=19$

Use the distributive property to evaluate the expression.

$3(8+5)$

Copy and complete: Multiplication and _?_ are inverse operations.

Which equation illustrates the identity property of multiplication?