C. 14. there are 40 questions in a competitive exam. 4 mark's awarded for each correct answer while -3 marks are being deducted for each incorrect answer .if donald attempts question and answered 21 questions correctly, how many marks did he get? one of his friend getonly 15 answers correct. what will be his score?

c

step-by-step explanation:

it would be see because your formula is f(x)=6x, so 6 times 1 is 6 and you go on and the best answer is c.

9

step-by-step explanation:

constant of proportionality = 3 and the equation is c = 3p.

step-by-step explanation:

c = kp   where c = amount of caffeine in mg., p = oz of pepsi and k is the constant of proportionality.

substituting the values given:

24 = 8k

k = 3.

the same value of k will be obtained if we substitute the other given values.