8. In 2009, U. S. families, on average, spent $541.25 on back-to-school supplies. In 2016, the figure rose to $681.25.

a. Find a linear model in the form, y = mx + b, that fits this data using x=0 to stand for
the year 2000

b. Use your model or perhaps another algebraic idea to predict the back-to-school cost in
the year 2025

15

step-by-step explanation:

we are given the following expression and we are to solve it and find the product:

-13 × (-5)

solving the given expression in the standard order of solving a mathematical expression, beginning with the opening of brackets and then multiplying the terms and changing their signs.

-3 × -5 = 15 (answer is positive because when negative is multiplied with negative, it gives a positive answer)

6

step-by-step explanation:

to find the perimeter, you add up all the lengths of the sides. in this case you would have to add up 18+22+40+80 which equals 160.