<u>Answer:</u>
The grade you make on your exam varies directly with the number of correct answers. The constant of variation is 5
<u>Solution:</u>
Given, The grade you make on your exam varies directly with the number of correct answers you get on the exam.
Answering 15 questions correctly will give you a grade of 75 what is the.
We have to find what is the Constant of variation.
Now, according to the given information, grade number of correct answer
Then, grade = c x number of correct answers, where c is constant of variation.
Now, substitute grade = 75 and number of correct answers = 15

Hence, the constant of variation is 5
Answer: (x,y,z) = (-4,0,-2)
Step-by-step explanation:
Answer:
59.5 sales tax, 909.5 total
Step-by-step explanation:
850 x .07 = 59.5
850 + 59.5 = 909.5