True or false: a relation R on a set A is an equivalent relation if it is reflexsive, anti-symmetric, and transitive

Which of the following scenarios demonstrates an exponential decay

Find the solution on the interval [0, 2pi)

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