What is the equivalent of this equation ? (9x^2-24x+16)^2-(5+6x−2x^2)

which of these is the answer?

a. 7x^2-30x+11

b. 7x^2-6x-21

c. 11x^2-30x+11

d. 11x^2-30x+11.
(i really need help)

Maria walks a round trip of 0.75 mile to school every day.how many miles will she walk in 4.5 days

Solve: 25 points find the fifth term of an increasing geometric progression if the first term is equal to 7−3 √5 and each term (starting with the second) is equal to the difference of the term following it and the term preceding it.

Find the distance between c and d on the number line c=3 and d=11