Verify as an identity: cos (90°+x) = - sinx

I'm not sure how to go about this question

he price of a flight was increased by 2% to £700. What was the price before the increase? Give your answer to the nearest penny.

1/2 animals on Lucy's farm are chickens. 2/3 of the chickens are females. What fraction of the animals on the farm are female chickens?

Add these fractions, giving your answer in simplest form. 1 1/4 + 1/2

For the function y = 9x, what is the output value if 5 is the input value? y = 4 y = 14 y = 45 y = 95

Suppose you have 52 feet of fencing to enclose a rectangular dog pen. The function A = 26x = x2 where x = width, gives you the area of the dog pen in square feet.

A toy box contains 4 different cars and 6 different trucks. in how many ways can a collection of 6 toys be chosen if the collection must consist of 2 cars and 4 trucks?

Constant of proportionality 4y=2x

What statements are correct? Check all that apply. The conditional probability formula is P (x l n m PO) The conditional probabilities P (D I N) and PON I D) are equal for any events D and N The notation PR probability of event R, given that event S

Stuart paid $48.00 for a new tennis racket, which was 64% of the original price. how much was the original price of the racket?

If one-third of a number is added to three-fourths of that same number, the sum is 26. Find the number. Select one: a. 12 b. 4 c. 8 d. 24