Answer:
y is the number of apples.
Step-by-step explanation: Because if x is the cost for one apple then y is for the number of apples.
When you are multiplying 2 numbers with exponents, you need to add the exponent. When you multiply an exponent with an exponent, you multiply them.
So,
(3^2 x 7^4) ^9
First multiply the base and add exponents = ( 21^6) ^9
= 21 ^6x9
21^54
The same rule applies for variables, just pretend there is an imaginary 1.
0.4 is 10 times as much as 0.04
this is because 0.04 times 10 is 0.4
0.003 is 1/10 of 0.03
0.003 times 10 is 0.03
Plus a negative value becomes subtraction:
-12 + -23 = -12 -23 = -35
