# What is 3d + ( 5- d ) if d = 4?

Aug 13, 2018

$13$

#### Explanation:

$\text{substitute "d=4" into the expression}$

$\left(3 \times \textcolor{red}{4}\right) + \left(5 - \textcolor{red}{4}\right)$

$= 12 + 1 = 13$

Aug 13, 2018

$3 d + \left(5 - d\right) = 3 d + 5 - d = 2 d + 5$

If $d = 4$ then $2 \times 4 + 5 = 8 + 5 = 13$