Write a function to represent each series of transformation
• rotation of 90 degrees counterclockwise about the origin, point o, then a reflection across the x-axis
• reflection across they axis, then a translation a units to the right and b units up
• translation a units to the right and units up, then a rotation of 180 degrees counterclockwise about the origin, then a
reflection across the y-axis

answer: i remember this but haven't done it in a while so forgot it, sorry.

the revenue of the fitness center, y, is the product of two factors: the number of members and the fee paid by each member. there are 320 members now, but number of members goes down by 10 for each $5 increase in fees, so if x is the number of $5 price increases then members is equal to (320 - 10x). since the fee is currently $45, and the fee increases by $5 for every price bump x, the fee is given by (45 + 5x). so, revenue y is given by y = (320 - 10x)(45 + 5x).