9514 1404 393
Answer:
- 21x -28y
- 30 minutes
Step-by-step explanation:
1. The distributive property tells you the factor outside parentheses multiplies each of the term inside parentheses.
7(3x -4y) = 7·3x -7·4y = 21x -28y
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2. Time, speed, and distance are related by ...
time = distance/speed
time = (20 mi)/(40 mi/h) = 1/2 h = 30 minutes
The drive takes 30 minutes.
