8 4
In the sketch,
SÂA = 90° and RĨA = 90°
T
22
A
S
30
R
4.1 If AR=30 mm and TA=22 mm, find
the value of angle A
4.2 Calculate the length of ST.

The revenue each season from tickets at the theme park is represented by t(c)=5x. the cost to pay the employees each season is represented by r(x)=(1.5)^x. examine the graph of the combined function for total profit and estimate the profit after four seasons