e monthly cost of driving a car depends on the number of miles driven. Lynn found that in May it cost her $438 to drive 420 mi and in June it cost her $558 to drive 720 mi. (a) Express the monthly cost C as a function of the distance driven d, assuming that a linear relationship gives a suitable model. C(d) = (b) Use part (a) to predict the cost of driving 1700 miles per month. $ (c) Draw the graph of the linear function. с 1000 000 с 1000 000

The Highlighted #1 question.

13. LANDSCAPE George hired some people to work on his yard one day per week for a month. At the end of the month George received a bill. On the bill he was charged $230 for 12 hours worth of work, including a monthly service fee of $50. a. Assuming that the relationship between the amount of the bill and the number of hours worked is linear, write an equation for this relationship. b. What is the slope of the line? What are the units associated with the slope of the line? What does the slope tell you about the problem situation? C. What is the vertical intercept of the line? What does the vertical intercept tell you about the problem situation?

A certain gas reserve held about 27 billion cubic feet of the gas in 2010 and is being depleted by about 1.7 billion cubic feet each year. (a) Give a linear equation for the remaining gas reserves, R, in terms of t, the number of years since 2010. (Let R be measured in billions of cubic feet.) R(t) =        (b) In 2015, what will the gas reserves be? (Round your answer to one decimal place.) billion ft3(c) If the rate of depletion doesn't change, in what year will the gas reserve be depleted? (Round your answer down to the nearest year.)