# How do you evaluate 7d – 5c if d = 7 and c = 3?

Mar 27, 2018

$34$

#### Explanation:

Given: $7 d - 5 c$

Plug in $d = 7 , c = 3$, we get,

$7 \cdot 7 - 5 \cdot 3$

$= 49 - 15$

$= 34$

Mar 27, 2018

49-15=34

#### Explanation:

First begin by substituting each variable for the number amount that is given (7 in for d and 3 for c). It will end up looking something like this:

$7 \left(7\right) - 5 \left(3\right) \mathmr{and} \left(7 \cdot 7\right) - \left(5 \cdot 3\right)$

It's just simple multiplication and subtraction from here on out:

$7 \cdot 7 = 49 \mathmr{and} - 5 \cdot 3 = 15$

So all simplified we get:

$49 - 15 = 34$