MTH/216T Week 3 Midterm Exam Q&A

MTH/216T Week 3 Midterm Exam Q&AMTH/216T Week 3 Midterm Exam Q&A Question 1 - Given a function described as equation y = 3x + 4, what is y when x is 1, 2, and 3? 7, 8, 9 3, 7, 11 3, 6, 9 7, 10, 13 Question 2 - Given this equation for converting temperature from Celsius (c) to Fahrenheit (f): f = (9/5)c + 32, what is f when c is 30? 77 86 95 104 Question 3 - What are m and b in the linear equation, using the common meanings of m and b? 1 + 4x + 6 – x = y m is 3, b is 7 m is 4, b is 6 m is 7, b is 3 m is 6, b is 4 Question 4 - The figure below shows costs for a current home mortgage versus a refinanced home mortgage. Refinancing has initial costs, but results in a lower monthly payment. Which best describes the lines? The blue line is for refinancing, which starts cheaper but eventually is costlier The blue line is for refinancing, which starts costlier but eventually is cheaper The orange line is for refinancing, which starts cheaper but eventually is costlier The orange line is for refinancing, which starts costlier but eventually is cheaper Question 5 - To draw a graph for y = 2x + 5, a person can draw a point at x of 0 and y of , a second point by going over 1 and up , and then draw a line through the points. 0, 5 2, 5 5, 2 2, 5 Question 6 - A parking lot charges $2 per hour for the first 4 hours, then $3 per hour after that. Which equation(s) describes the total cost y as a function of the hours x? y = 3x + 8 y = 2x + 12 y = 2x for x of 4 or less / y = 2x + 3x for x of 5 or more y = 2x for x of 4 or less / y = 8 + 3(x – 4) for x of 5 or more