Applying and analysing functions

A plumber charges $50 for a service call plus $25 per hour of service. Write an equation in slope-intercept form for the cost, y, after x hours of service.

• y = 50x + 25

• y = 25x + 50

• y = 75x

• y = 25x

In reference to the previous question, the ratio its height to the radius of the base is.

• 4

• 3

• 2

• 3/2

Calculate the line of best fit.

• y = 510x + 8750

• y = 8750 + 510x

• y = 3x + 10700

• y = 10700x + 3

What was your answer to #6? Round to the hundredth. Do not type the $ symbol.

Zoe, Abigail, and Aiden are having a blast playing a game of golf on a sunny afternoon. Imagine the golf ball is hit straight as an arrow, neither rising nor falling, and it starts its journey 3 feet below the level of the hole. Can you figure out the equation that represents the path of the golf ball?

• y = -3

• y = 0x - 3

• y = -3x

• y = 0x

Answer explanation

The equation of a line with a slope of 0 and a y-intercept of -3 is y = -3. This is the correct choice because when the slope is 0, the line is horizontal and does not change in the y-direction.

A set of kitchen utensils has an original cost of $70. Ann has a coupon for 7% off. Select an equation to represent the final price of the item.

A plumber has owned his own business for 21 years. He charges $25 for a service call plus $50 per hour of service. Write an equation in slope-intercept form for the cost, C, after h hours of service.

• C = 50h + 25

• C = 25h + 50

• C = 50h - 25

• H = 25h - 50

In "Happy Feet", who is the penguin who can't sing?

• Tumble

• Mumble

• Bumble

• John

Speedy Boat Rental charges a $15 deposit fee plus $2 for each hour of use to rent a paddle boat. Write an equation to represent this situation.

• y = 2x + 15

• x = 15y + 2

• y = 15x+ 2

A box of cupcakes has an original cost of $35. An additional 30% fee is charged for delivery. Select all equations that can be used to represent the final price of the item.