reduce the negations for all of the following:
3) ~ (a < --> b)
4) (~a & ~b) & (~c v ~d)
5) a --> (b v ~c)
6) [a --> (b --> ~c)] --> [(~d --> ~e) --> f]
7) ~a v ~b
8) ~(a v b)
9) [~~a v (~b & c)] v (~~d --> ~~~e)
10) ~(a < --> b)

a

explanation:

you'll just earn points here

step-by-step explanation:

the revenue of the fitness center, y, is the product of two factors: the number of members and the fee paid by each member. there are 320 members now, but number of members goes down by 10 for each $5 increase in fees, so if x is the number of $5 price increases then members is equal to (320 - 10x). since the fee is currently $45, and the fee increases by $5 for every price bump x, the fee is given by (45 + 5x). so, revenue y is given by y = (320 - 10x)(45 + 5x).

answer:

it is 28 degrees colder in detroit than philadelphia.

step-by-step explanation:

what number adds to 21  

-7 + ? = 21

-7 + 28 = 21

hope it