A baseball is thrown off a building 320 feet high at an initial upward speed of 80 feet per second: the height of the baseball relative to the ground is modeled by F( X) = -16T^2 + 80T + 320. How long does it take the baseball to reach its highest point? 4.2 seconds
4 seconds
7.6 seconds
2.5 seconds
5.2 seconds

what is

step-by-step explanation:

mgxmgzmgzzzlgxhhhx. dlulhx

the answer is z7+8/5

part a: triangles gcb and epb

part b. sides cg and rp are parallel by definition of parallelogram.

angles cgb and e are congruent by being alternate interior angles of parallel lines cut by a transversal. angles gbc and ebp are congruent because they are vertical angles. by aa similarity, the triangles are similar.

part c. since the triangles are similar, the ratios of the lengths of corresponding sides are equal.

calculation of be:

gb/be = cb/bp

(400 ft)/be = 300/200

(400 ft)/be = 3/2

3be = 2 * 400 ft

3be = 800 ft

be = 800/3 ft

calculation of pe:

gc/pe = cb/bp

(350 ft)/pe = 300/200

(350 ft)/pe = 3/2

3pe = 2 * 350 ft

3pe = 700 ft

pe = 700/3 ft