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 situations represents a linear relationship? a. theresa increases the distance she runs by 0.1 miles every week. b. the volume of a box depends on the length of box. c. the amount of money in a bank account increases by 1 percent each year. d. the population of a town doubles every 5 years.

Segment xz is bisected by point y. if xy = 12x, and the measure of xz = 18x – 6, solve for x

Type the correct answer in the box. use numerals instead of words. if necessary, use / for the fraction bar. a city water tank holds 20 gallons of water. a technician empties 25% of the tank. how many more gallons of water must be removed from thetank so that it has 5 of the water that it started with: the technician must removemore gallons of water for the tank to have 5 of the water that it started with.