### Home > CC3MN > Chapter 2 > Lesson 2.1.2 > Problem2-19

2-19.

Remember that one meaning of the word “evaluate” is to replace a variable with a number and to calculate the result. For example, evaluating the expression $x^2$ when $x=−2$ results in the solution $(−2)^2=4$.

Evaluate the expressions below for the given values.

1. $−4d+3$ if $d=−1$

Substitute $−1$ for $d$.

$−4(−1)+3$

Simplify the terms and combine them.

$4+3=7$

$7$

1. $k−m$ if $k=4$ and $m=−10$

Follow the steps in part (a).

Put everything you substituted inside parentheses so you do not lose track of your negative signs.

$(4)−(−10)$

1. $\frac{t}{w}$ if $t=6$ and $w=−3$

Follow the steps in part (a).

$−2$

1. $x^2+y^2$ if $x=7$ and $y=5$

Follow the steps in part (a).