Prove cos (x - n) = - cOS X.

cos (x - 7) = cos x sin n - sin x cos n = - cos X

cos (x - n) = cos x cos n - sin x sin n = - cos X

cos (x - n = cos x sinn + sin x cos n = - cos X

cos (x - n) = cos x cos n + sin x sin n = - cos x

10 less than j is 35

Im having trouble with this word problem. A train travels 160 km in the same time that a plane covers 720 km. if the speed of the plane is 20 km per hour less than 5 times the speed of the train, find both speeds. Not sure how to solve.

70 is 20% of what number

An item is priced at $13.54. If the sales tax is 6%, what does the item cost including sales tax? A. $14.35 B. $0.81 C. $27.89 D. $21.66

If the probability of choosing a strawberry from a bag of strawberries, pears and apples is 0.37, and the probability of choosing a pear is 0.12, what is the probability of choosing an apple?

What is 2.25 as a fraction

Suppose that two cards are randomly selected from a standard? 52-card deck.? (a) what is the probability that the first card is a clubclub and the second card is a clubclub if the sampling is done without? replacement??

In 5 h, you drive 400km. how much km could you drive in 1 h.

What differnce between 7/8 and 1/4

Ms Gegory had $300 to purchase sports equipment for summer camp she bought 6 soccer balls. Each basketball cost $16.98, and each soccer ball cost 13.79 how mush money did she have left after these purchases?