Find the value of x for which (5
3
)
-2 × (5
3
)
-14 = (5
3
)
8x

Varies inversely with x. if y=8.5 when x=-1 find x when y=-1

Is the number 128.439 a rational number

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