Amy tutors math. For each hour that she tutors, she earns 30 dollars. Let E be her earnings (in dollars) after tutoring for H hours.

Write an equation relating E to H. Then use this equation to find Amy's earnings after tutoring for 13 hours.

Equation:
Amy's earnings for 13hour :dollars

e = 30h 390 dollars after 13 hours

Step-by-step explanation:

e = earning

h = hours worked

e = 30h

30×13=390

50-38=12

step-by-step explanation:

36 girls

step-by-step explanation:

the 48 boys is 4 parts of the ratio

divide 48 by 4 to obtain one part of the ratio

= 12 ← 1 part of the ratio

3 parts = 3 × 12 = 36 ← number of girls