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A golfer hits a golf ball with an initial velocity of 50 m/s. The height of the ball, h in metres, after t seconds, can be modelled by the function
h= − 4.9t^2 + 50t .
a) What was the height of the golf ball when it was hit?
b) Determine the maximum height of the golf ball.
c) Determine the golf ball’s height after 3 seconds.
d) Determine the roots and explain their meaning.
e) Sketch the function

Let A, B be nonempty sets and a, b ∉ A, 1, 2 ∉ B. Show that if A ~ B, then A ∪ {a, b} ~ B ∪ {1,2}

What is the amplitude of  

_____ units

What is the period of the function

g(x) = -sin (-8x - 3) + 5?

Give an exact value. 

___ units

Find the following trigonometric values.

Express your answers exactly.

What is the reference angle for 140 degrees?