Kevin has the following averages in her
math class:
homework avg.: 88
quiz avg.: 84
test avg.: 92
final exam: ? ?
if the teachers weights homework at 20%
quizzes at 25%, tests at 40%, and the
final exam at 15%, what is the minimum
grade kevin can make on the final exam so
that she scores a 90 in the class?
a. 90
c. 86
d. 94
b. 97

b. 97

Step-by-step explanation:

Home work = 88  

20 % of 88 =   88 x 20/100 = 17.60

Quiz Average= 84  

25 % of 88 =   84 x 25/100 = 21

Test Average= 92

40 % of 92=   92 x 40/100 = 36.8

Add all = 17.60 +21+ 36.8=  75.40

Let the marks be x in final exam

The percentage is 15 % and scores a 90 in a class we can write

15x/100  + 75.40 =90

0.15x= 90-75.40

0.15x= 14.60

x= 14.60/0.15= 97  

final exam marks will be 97

step-by-step explanation:

just plug in each number for x and see which ones work and don't