posted by Amanda on .
If a student needs an average of 70 or more to pass a course. She has scored 90, 76, and 66 on the first three exams. writing an inequality representing the score she must get on the last test to pass the course
letting x be for the exam that's missing.
on the left side write: 90+76+66+x divided by 4 then do the symbol the greater than or equal and for the right side write out : 70 divided by 4
so now you should have:
90+76+66+x greater than or equal to 280
then add the test scores
232+x greater than or equal to 280
then subtract 232 from both sides to get x alone
x greater than or equal to 48
therefore he needs 48 to get a 70 average in the class to pass to check:
add all the test scores and divide them for how many they are. so
90+76+66+48 = 280 then 280 divided by 4 = 70