Use a calculator to find the approximate value of the expression. round the answer to two decimal places.

the cosine of the complimentary angle of 60°.

a.

0.50

c.

0.25

b.

0.86

d.

0.71

Grace is standing 18 feet from a lighthouse and kelly is standing 10 feet from grace. the angle that grace looks up to see the top of the lighthouse is 45°. the angle that kelly looks up to see the top of the lighthouse is y°. find the height, h, of the lighthouse. find the angle, rounded to the nearest tenth of a degree, in which kelly looks up to the top of the lighthouse. to the nearest tenth of a degree, find the value of x° . in two or more sentences, explain your calculations