Which of the following statements is true according to the associative property of multiplication? (5 × 4) × 20 ≠ 5 × (4 × 20) (5 × 4) × 20 = (5 ÷ 4) ÷ 20 (5 × 4) × 20 ≠ 400 (5 × 4) × 20 = 5 × (4 × 20)

x + y = 90 5x – 10y = 90 90 – 10y = 5x 90 + 10y = 5x

step-by-step explanation:

last month maria hiked the 5-mile mountain trail a number of times and she hiked the 10-mile canal trail several times. let x represent the number of times she hiked the 5-mile trail, and let y represent the number of times she hiked the 10-mile trail. if she hiked a total of 90 miles, which equation can be used to find the number of times maria hiked each trail? x + y = 90 5x – 10y = 90 90 – 10y = 5x 90 + 10y = 5x

answer is  

c.

36

step-by-step explanation: