The problems are
What operation in arithmetic represents each of the following?
1) Decreased by
2)sum of
3)increased by
The second problem is
A car rental agency charges $40 per day and $0.20 a mile for each mile over 100 miles. If the charge for one day rental was $70, how many miles was the car driven?
How do you write an equation to solve this problem?
Write and solve this equation.
Is the solution of this equation of the solution of the problem? Why?
THANKS IN ADVANCE!
2007-10-23 07:25:24 · 4 answers · asked by babygirl 1 in Science & Mathematics ➔ Mathematics
250 miles, but I cannot give you an equasion, sorry!!!
2007-10-23 07:36:54 · answer #1 · answered by Petero 6 · 0⤊ 0⤋
I will do #2.
Let x = # of miles it was driven.
This may or not be over 100 miles!
charge C(x) = { 40 if x <= 100
{ 40 + (x-100)*.2 if x>100
The simplest I can think of right now is a piece-wise function.
Since the total charge was $70, obviously, it was driven MORE than 100 miles! We use the second piece:
70 = 40 + (x-100)*.2, gather
30 = (x-100)*.2, divide by .2
30/.2 = x-100 or
150 = x-100 or
x = 250 miles total.
2007-10-23 14:37:18 · answer #2 · answered by pbb1001 5 · 0⤊ 0⤋
I only understand the second question.
70 = 40 + (n-100)0.2 where n is the number of miles traveled over 100 miles.
2007-10-23 14:38:52 · answer #3 · answered by Anonymous · 0⤊ 0⤋
Practice this phrase "Would you like Fries with that?"
Do your own homework and maybe you won't end up extremely dumb.
2007-10-23 14:33:45 · answer #4 · answered by Joseph T 4 · 1⤊ 0⤋