Answer:
1). Option (2)
2). Option (4)
Step-by-step explanation:
1). Formula to evaluate the actual cost 'a' of an item with original price 'm' and a discount coupon for 'n' dollars applied will be,
a = m - n
n = m - a
Therefore, expression (2) will be the answer.
2). Deon ride a 15 mi bicycle trail.
Average speed of the trail is = 20 miles per hour
From the formula,
Speed =
Time =
= hours
Therefore, Option (4) will be the answer.