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

A box of chalk and 2 staples cost$10. three boxes of chalk and 2 staplers cost $18. Find the total cost of 1 box of chalk and 1 stapler

How many hundred is in 527000

As a decimal 6 27/100

Whats the formula of 90 degrees

While riding in a car, Rachel saw 11 red cars pass by in one minute. At this rate, how many red cars will she see in 4 hours?

42/45 greater or less than 3/15

Find the unit cost of a store sells a dozen eggs for 1.99.

Solve the equation. If necessary, round your answer to the nearest tenth. 4 = 121 A. 2.75, - 2.75 B. 5.5, - 5.5 C. 11, - 11 D. 30.25, - 30.25

After 56 cans of soup were sold, a clerk moved the remaining cans to a display case. The display case had shelves that could each hold 9 cans. How many shelves were needed to fit all the remaining cans?

Mia did this problem 1336 of 1/8 is 3/6 what did Mia get wrong?