\(8(s + 3) = 72\)

\(-7(z - 6) = -70\)

\((t + 8)(-2) = 12\)

\(\frac{8}{11}(n - 10) = 64\)

\(-0.6(r + 0.2) = 1.8\)

\((w - \frac{4}{9}) (-\frac{2}{3}) = - \frac{4}{5}\)

The length of each side of an equilateral triangle is increased by 5 inches, so the perimeter is now 60 inches. Write and solve an equation to find the original length of each side of the equilateral triangle. 
Equation:                                                            Solution:

Multiple Representations Miguel and three of his friends went to the movies. They originally had a total of $40. Each boy had the same amount of money and spent $7.50 on a ticket. How much money did each boy have left after buying his ticket?
a. Model Draw a bar diagram that represents the situation.

b. Algebra Write and solve an equation that represents the situation.

c. Words Explain how you solved your equation.

d. Words Compare the arithmetic solution and the algebraic solution.