The price of an item has dropped to $42 today. yesterday it was $105. find the percentage decrease.

CORRECT ANSWER: It decreased by 40%
CORRECT SOLUTION:
1. Divide the 42 by 105 (make sure you divide the after amount before the actual amount)
2. The answer you get is 0.4
3. move decimal point 2 places to the right and you get your answer
Hope this helps :)

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