What would the answers be for these questions. and can you tell me what i am doing wrong?

56)

4^0 * 4^2 * 4^2 /4^2

=4^(0+2+2 - 2)

=4*2

= 16

66)

(2^3)^-3

= 2^(3 *(-3))

= 2^-9

= 1 / 2^9

76)

(3^-1)^^4

= 3^(-1 * 4)

= 3^-4

= 1 / 3^4

86)

(2^2)^-4 * 2^2 ^ 2^0

= (2^-8) * 2^2 * 1

= 2^(-8 + 2)

= 2^-6

= 1 / 2^6

so then what are you asking?

step-by-step explanation:

she would want to sell 10 full-year subscriptions and at least 9 half-year subscriptions to get a total of at least $300. 

i hope this answer you! if you have any further questions or concerns, feel free to ask! : )

step-by-step explanation:

mark brainliest!