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

You have 480 feet of fencing to enclose a rectangular garden. you want the length of the garden to be 30 feet greater than the width. find the length and width of the garden if you use all of the fencing.

What is the property of (9*5) d

It takes 1 and 1 4th cups of milk to make 8 pancakes, how many cups of milk is needed to make 20

In 2011, the average daily temperature in Darrtown was 65°F. In 2012, the average daily temperature increased by 3% but then decreased by 4.5% in 2013. What was the daily average temperature in Darrtown in 2013?

Find the product of.

What is the rule for extend pattern for 2 4 8 16?

What is the orthocenter of the triangle with two altitudes given by the lines x = - 1 and y = x + 1.: (0, - 1) (-1, - 2) (-1, 0) none of these

Brenda is finding the product of - 3r and - 2r^2+3r Is she correct? If not, what changes should be made? - 3r (-2r^2+3r)

If x=73, what does 4x+3 equal?

How to simplify - 9+-1/3y+6-4/3y