For the linear model, y=-67.9x + 679, the distance, in miles y, is a function of time, x, in hours. use the model to calculate the total distance, in miles, x=5 hours.
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The wheels of a bicycle have a diameter of 70cm. how many meters will the bicycle travel if each wheel makes 50 revolutions

Astudent draws two parabolas on graph paper. both parabolas cross the x-axis at (–4, 0) and (6, 0). the y-intercept of the first parabola is (0, –12). the y-intercept of the second parabola is (0, –24). what is the positive difference between the a values for the two functions that describe the parabolas? write your answer as a decimal rounded to the nearest tenth

You eat $0.85 for every cup of hot chocolate you sell. how many cups do you need to sell to earn $55.25