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# 1Math 50 : Elementary Algebra - page 8 / 15

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37. A bicycling club rides out into the country at a speed of 15 mph and

returns over  the same road at 12 mph. How far does the club ride out into the country if it travels a total of 9 hours?

Rate

Time

Distance

TO

15 mph

RETURN

12 mph

TOTAL

9 hrs

38. The width of the rectangular foundation of a building is 30% of the

length. The perimeter of the foundation is 338 ft. Find the length and width of the  foundation.

39. Find the slope of the line that contains the points ( 9, 8) and ( 2, 1).

40. Find the x-intercept and y-intercept of the graph of the equation for

3x 2y = 24.

41. Find the ordered-pair solution of y = 4x + 1 that corresponds to x = 9.

42. of advertising time during selected Super Bowl games.

Year

1967

1971

1976

1981

1988

1991

1996

Price

\$42,000

72,000

110,000

275,000

550,000

800,000

1,085,000

Price = the price of 30 seconds advertising time.

(a)

Find the average rate of change per year in the price of 30 seconds of

advertising time from 1976 to 1996. Round to the nearest thousand.