C = 25 + 7h...c = 81
81 = 25 + 7h
81 - 25 = 7h
56 = 7h
56/7 = h
8 = h......so at 8 hrs, it will cost $ 81
Answer:
Step-by-step explanation:
Given
Required
Rewrite to remove fractions
The denominators in the above expression are 4 and 6.
So, first we take the LCM of 4 and 6
Next, multiply both sides of the equation by this LCM (12)
Answer:
7 miles aprox (estimated)
full answer is 6.66666667
Answer:
a. 4 and 120. b. 260 miles. c. 140 miles.
Step-by-step explanation:
d(t) = 400-70t.
a. (4,120) refers that with t=4 (when the driver has driven 4 hours), he is incorrect: 120 miles from his destination. d(4) = 400-70(4) = 400-280 = 120.
b. After driving 2 hours, that is in t=2, he is d(2)= 400-70(2) = 400-140 = 260 miles from his destination.
c. In his second hour of driving, that is in t=2 he is 260 miles from his destination, so he has driven 140 miles.