Thursday Bellwork

Which relationship is likely ONLY a correlation and NOT one of causation?

• As the temperature increases, the number of air conditioners being used increases.

• As the price of a gallon of gas increases, the number of gallons of gas sold decreases.

• As the number of visitors to a park increases, the number of flowers in bloom at the park increases.

• As the amount of time a student spends studying for a test decreases, the student's score on the test decreases.

At a store, 6 shirts and 2 pairs of shoes cost $516. Each shirt costs the same amount, and each pair of shoes cost the same amount, but each shirts costs $8 more than a pair of shoes. Which system of equations can be used to find the cost of each shirt, x, and each pair of shoes, y?

• 6x + 2y = 516

  x + 8 = y

• 6x + 2y = 516

  x = y + 8

• 2x + 6y = 516

  x + 8 = y

• 2x + 6y = 516

  x = y + 8

• 47

• 33

• 25

• 17

In whose case is the amount increasing at a constant percent rate relative to time? Find the value of the rate.

• is increasing at a constant percent rate in Marcus' case at 7% per annum.

• is increasing at a constant percent rate in Brad's case at 7% per annum.

• is increasing at a constant percent rate in Marcus' case at 6% per annum.

• is increasing at a constant percent rate in Brad's case at 5% per annum.

• -g, -h

• -g, h

• g, -h

• g, h

Breyelle is planning on purchasing a new sports-utility vehicle. The list price of the one she is most interested in buying is $32,000. This vehicle is expected to depreciate by 8.5% per year. Which model could be used to calculate the daily depreciation for this vehicle?

The cost to rent a bicycle at Freewheels is $10 plus an hourly rate for each hour the bicycle is rented. The graph represents the linear relationship between the cost, in dollars, to rent a bicycle and the number of hours rented. Based on the graph, which statement is true?

• Freewheels charges a $4 initial fee and $10 per hour.

• Freewheels charges a $10 initial fee and $4 per hour.

• Freewheels charges an $8 initial fee and $42 per hour.

• Freewheels charges a $42 initial fee and $8 per hour.