A truck can be rented from Company A for $90 a day plus $0.40 per mile. Company B charges $50 a day plus $0.80 per mile to rent the same truck. Find the number of miles in a day at which the rental costs for Company A and Company B are the same.

100 miles

Step-by-step explanation:

50 + 0.80n = 90 + 0.40n                             N = number of miles

50 - 50 + 0.80n = 90 - 50 + 0.40n

0.80n = 40 + 0.40n  

0.80n - 0.40n = 40 + 0.40n - 0.40n

0.40n = 40

0.40n/0.40 = 40/0.40

N =  100

answer: two angles are called supplementary if they add up to 180°. example: the two angles (140° and 40°) are supplementary because they add up to 180°.

step-by-step explanation: