At a school trivia competition, contestants can answer two kinds of questions: easy questions and hard
questions. Easy questions are worth 3 points, and hard questions are worth 5 points. Chantrea knows
that she correctly answered 21 questions and that she had a total of 79 points. How many hard ques.
tions did she answer correctly?
A. 7
B. 8
C. 12
D. 13
E. 15

B.

Step-by-step explanation:

so 8*5 is 40 which leaves 39 points to be accounted for.

39/3 is 13 (easy questions)

8+13=21 which is the amount of questions Chantrea answered correctly so yee

the revenue of the fitness center, y, is the product of two factors: the number of members and the fee paid by each member. there are 320 members now, but number of members goes down by 10 for each $5 increase in fees, so if x is the number of $5 price increases then members is equal to (320 - 10x). since the fee is currently $45, and the fee increases by $5 for every price bump x, the fee is given by (45 + 5x). so, revenue y is given by y = (320 - 10x)(45 + 5x).