Which operation should you perform first in the expression 15 + 7 × (5 − 3) × 4^{2} [/tex] ÷ 6?
a.) 15 + 7
b.) (5 − 3)
c.) ÷ 6
d.)

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