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in each scenario, represent the problem with an equation and answer the question.

9) on saturday, the temperature started at -7°c. by midnight, the temperature was 6°c. how much did the temperature change?

a. equation:

b. change in temperature:

10) on sunday, the temperature started at -10°c. by evening, the temperature was -2°c. how much did the temperature change?

equation:

change in temperature:

Jenisey has $24 to spend on seven pencils. after buying them she had $10. how much did each pencil cost.?

Amodel rocket is launched from a roof into a large field. the path of the rocket can be modeled by the equation y = -0.04x^2 + 8.6x + 4.8, where x is the horizontal distance, in meters, from the starting point on the roof and y is the height, in meters, of the rocket above the ground. how far horizontally from its starting point will the rocket land? a. 0.56 m b. 215.56 m c. 431.11 m d. 215.74 m

Aretha wanted to gather data about the cost of local bowling leagues in her area. she plotted the data and determined that the average bowling league costs consist of a one-time registration fee and a monthly fee modeled by the equation y = 15x + 20. identify and interpret the y-intercept in this model. the y-intercept is 20. this is the cost per month. the y-intercept is 20. this is the cost of registration. the y-intercept is 15. this is the cost of registration. the y-intercept is 15. this is the cost per month.