2. Evaluate (3x + 8) – (2x + 7) when x = 3. 11 1 4 18

4

Concept:

Here, we need to understand the idea of evaluation.  

When encountering questions that gave you an expression with variables, then stated: "If x = a, y = b, z = c" (a, b, c are all constants), this means you should substitute the value given for each variable back to the expression.

Solve:

Given information

x = 3

Given expression

(3x + 8) - (2x + 7)

Substitute values in the expression

=(3 (3) + 8) - (2 (3) + 7)

Simplify by multiplication in parentheses

=(9 + 8) - (6 + 7)

Simplify by addition

=17 - 13

Simplify by subtraction

=

Hope this helps!! :)

Please let me know if you have any questions

11 15 15/x

Jonah spent the cost of a movie ticket and split the cost of popcorn, so this needs to be represented by a " + ". Jonah just buy one piece tickets, so 11 is tickets price. We know Jonah's costs represented by the expression 11+15/x, "x" on behalf of the number of he and his friends, so 15 is the price of popcprn. 15/x means one person's money for the poopcorn, including Jonah.