Answer:
C. 75 • $6 - $35
Step-by-step explanation:
First, 75 times 6 needs to be in the expression to represent how much they raised from washing the 75 cars.
Then, 35 has to be subtracted because that was the cost of the supplies:
So, C is correct, 75 • $6 - $35
Answer:
5/9 & -10/3
Step-by-step explanation:
Set each to 0 and solve:
9x-5 = 0
9x=5
x=5/9
6x+20=0
6x=-20
x=-20/6
x= -10/3 or -3 1/3
100% of the price = $400
x % of the price = $320
we need to find x
using a proportion
100 : 400 = x : 320
100 * 320 = 400 * x
32000 = 400x
x = 32000 / 400
x = 80
That means the new price is 80% of the previous price.
100% - 80% = 20%
and based on this we can make a conclusion that the discount was 20%
I hope it is clear to you, feel free to ask anything about it :)
