The formula p=8n-30 gives the profit p when a number of items n are each sold at $8 and expenses totaling $30 are subtracted
a. if the profit is $170.00, how many items were bought
b. if the same number of items were bought but the expenses changed to $40, would the profit increase or decrease, and by how much

A:
p = 8n - 30
170.00 = 8n - 30               add 30 to each side
200.00 = 8n            divide by 8
25 = n              25 items were bought.

B:
The profite would decrese  

8(25) - 40
200 - 40
160        original was 170 but it decreased by 10$

hope this helped :)

Ibelieve a is the correct answer because 3 is the y-intercept you can see it from the graph. so from here the answers could only be a and c. they are differently at the sign.substitute x with 1so the equation for a is 3*(1.4)^x3*(1.4)^1 = 4.2look back at the graph it is true that when x= 1 y= 4.2if you use equation from c. when x= 1 then y will be negative number which is falseso correct answer is a