Prove that: 1/2^2 + 1/3^2 + 1/4^2 + ... + 1/n^2 < n-1/n. Please answer by tomorrow-

What is the remainder when 2872 is divided by 76? a) 51 b) 57 c) 60 d) 63

Amanager recorded the number of bicycles sold by his company each quarter. his projected sales after t years is given by the expression below. which of the following statements best describes the expression? a. the initial sales of 575 bicycles increases at the rate of 4% over 4 quarters. b. the initial sales of 575 bicycles increases at the rate of 18% over 4 years. c. the initial sales of 575 bicycles increases at the rate of 4% over t quarters. d. the initial sales of 575 bicycles increases at the rate of 18% over t years.

Can someone me with #s 8, 9, and 11. with just one of the three also works. prove using only trig identities.