Alg 1 Question

Question

Algebra 1 - Linear Rate of Change:
Marcus is trying to figure out his score on a recent math test. He writes a function, f, that describes his score as a function of the number of questions he gets right, x. Given this info, what does the equation below represent?
f(20) - f(17) / 20-17 = 5

(f of 20 minus f of 17 divided by 20 minus 17 equals 5)

Answer 1

ANSWER: each question is worth 5 points

EXPLANATION:

you have found the slope of the linear function given points (20, f(20) ) and ( 17, f(17) )

where f(20) is the score for 20 questions and f(17) is the score for 17 questions

Each question is worth 5 points...

therefore, 17*5 = 85

and 20*5 = 100

(100 - 85)/(20-17) = 15/3 = 5