What is greater than 525.06 but less than 525.6?

Which term best describes the association between variables a and b

Factor and solve to find roots x squared -x - 90 =0

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.