### Home > CCA > Chapter 1 > Lesson 1.1.2 > Problem1-14

1-14.

Evaluate each expression if $r=−3,s=4$, and $t=7$.

1.  $r^2+\sqrt{s}$

Substitute the two values into the equation. Assume that there are parentheses around the negative value.

$(-3)^2 + \sqrt {4}$

Use the Order of Operations to find the answer.

$(9) + 2 = 11$

$11$

1. $\frac { t - r } { S }$

• Find the value of the numerator, before dividing by the denominator. Remember to simplify the fraction

$2\frac{1}{2}$

1. $2s^2+r−t$

Use the Order of Operations to find the answer.

$22$

1. $3(s−t)^2$

Use the Order of Operations to find the answer.

$27$