Answer:
a) 100 metres
b) 10 metres
Step-by-step explanation:
Given: the approximate height, h, in meters, travelled by golf balls hit with two different clubs over a horizontal distance of d meters is given by the functions: 
To find: distances when the ball is at the same height when either of the clubs are used. Also, to find this height
Solution:
(a)

(b)
Put d = 100 in 

Answer:
x = 90 y = 45
Step-by-step explanation:
Answer:
B
Step-by-step explanation:
It is complementary because adding DEQ and REQ together adds up to 90 degrees