Verify if this is an identity

cot (-x) tanx=-1

In the quadratic equation x2 - 8x + a = 0; what is the value, a, in order to form a perfect square?

What is 5/8 times 1/2

Liza needs a total of 22.23 square feet of terry cloth to make a beach towel and a beach bag. the beach bag requires 5.13 square feet of cloth. what is the length of the beach towel

Jim leaves his house traveling at 200 feet per hour, he wants to travel 400 yards to get to 4:00pm. How many hours does he need to travel? Answer and explain your answer. I'm giving brainliest for the best answer. A. 2 hours B. 4 hours C. 5 hours D.

What is the range of this function? {-4,1,7,15} {-1,4,8,18} {-4,-1,1,4,7,8,15,18} {-4,-1,15,18}

If the 9th day of a month is on tuesday on what day is 25th

Which polygon in the floor plan have four equal sides and four congruent angles?

At the dog show there are 4 times as many boxes as spaniels. if there are a total of 30 dogs how many dogs are spaniels

Which pairs of polygons are congruent?

Eve is going to buy 30 pens from either shop A or shop B. Shop A: pack of 10 pens for £1.90 Shop B: pack of 5 for £1.10 buy 1 pack and get 1 half price. What is the difference in cost for all 30 pens between the two shops?