Can someone explain how to find the answer for this pre-calculus question?

Select the best answer.

cot A sin 2A=

a. 1 + cosA

b. 1 + sin2A

c. 1 + cos2A

Ax-b=c solve for b A - b = - ax-c B - b=ax+c C - b = - ax+c D - b=ax-c

Tristan's flight was 180 minutes one way. how many hours did he spend flying round trip?

Spent $42.75 on groceries. Spent twice as much on fruits and vegetables than the rest of the groceries. How much was spent on the fruits and vegetables?

A rock climber's elevation above sea level changed - 8212 feet in 214 minutes as she descended. What was the climber's average change in elevation per minute? Enter your answer as a mixed number, in simplified form, in the box. in ft

Express the following fraction in simplest form using only positive exponents. 4j^7/5 (j^2) 3

Dr. Barber ordered 121 syringes and 53 needles. In total, how many items did Dr. Barber ordered

Jaime wants to know how fast she can type, so she times herself as she types a paper. The paper has 442 words in it, and Jaime types it in 13 minutes. What is her typing rate, in words per minute?

How can one fourthx - 3 = one halfx + 8 be set up as a system of equations?

Chris invests $2,200 into three accounts that pay 6%, 8% and 9% in annual interest. He has three times as much invested at 9% as he does at 6%. If his total interest for the year is $178, how much is invested at each rate?

If AC = 12 and BC = 13, find AB.