when you subtract a negative number from any platitude number the equation changes to addition so you would add the value of the negative number to 1.
Answer:
Hi,
Step-by-step explanation:

72 is 50 or above so you round it up.
<u />572 to the nearest hundred is <u>600</u>
Yes your answer is correct... Because as per the question the equation formed should be y = 5(3)^x.