4. Two music teachers own a studio where they give lessons. The following expressions give the cost, C, for each music teacher after h, the number of hours
Piano:
Drums:
C = 20h + 40
C = 15h + 100
a) Write a simplified combined (HINT: addition) expression representing the cost for having two
music teachers at once. (T 4)
b) If Naomi hires both music teachers for 5 hours, how much will she pay? [T 3]

Which of the following could be the graph of the equation y = -2x + 5

Finally, the arena decides to offer advertising space on the jerseys of the arena’s own amateur volley ball team. the arena wants the probability of being shortlisted to be 0.14. what is this as a percentage and a fraction? what is the probability of not being shortlisted? give your answer as a decimal. those shortlisted are entered into a final game of chance. there are six balls in a bag (2 blue balls, 2 green balls and 2 golden balls). to win, a company needs to take out two golden balls. the first ball is not replaced. what is the probability of any company winning advertising space on their volley ball team jerseys?

Elizabeth claims that the fourth root of 2 can be expressed as 2^m since (2^m)^n = 2. find the values of m and n for the case where elizabeth's claim is true.