Answer: an expression obtained by a finite number of the fundamental operations of algebra upon symbols representing numbers.
Step-by-step explanation: In mathematics, an algebraic expression is an expression built up from integer constants, variables, and the algebraic operations. For example, 3x² − 2xy + c is an algebraic expression.
Shawna and her best friend Keisha together spend $ 138
<h3><u>
Solution:</u></h3>
Given that, Shawna and her best friend Keisha go shopping.
The function given for money each girl spent based on the number of hours they were shopping is:

<em><u>Find the amount of money that each girl spent</u></em>
For t = 2 hours

<em><u>Find the amount of money that they spend together</u></em>
Multiply by 2 the amount of money that each girl spent

Answer: see below
<u>Step-by-step explanation:</u>
12) 2(x + 4) = 8
<u> ÷2 </u> <u> ÷2 </u>
x + 4 = 4
<u> -4 </u> <u> -4 </u>

14) 4w - 2(1 - w) = -38
4w -2 + 2w = -38
(4w + 2w) - 2 = -38
6w - 2 = -38
<u> +2 </u> <u> +2 </u>
6w = -36
<u> ÷6 </u> <u> ÷6 </u>

16) 10(1 - 2y) = -5(2y - 1)
10 - 20y = -10y + 5
<u> +20y </u> <u>+20y </u>
10 = 10y + 5
<u> -5 </u> <u> -5 </u>
5 = 10y
<u> ÷10</u> <u> ÷10 </u>

