Question 916777
x=score on the final exam
y=average score for the course
The number called the divisor is seven. The reason the divisor is seven is there are four tests plus the final exam, which is worth three tests.
(91+90+83+93+x)/7=y
(357+x)/7=y
357/7+x/7=90
51+x/7=90
x/7=90-51
x/7=39
x=273