Homework Help: math

Posted by Amanda on Sunday, April 22, 2007 at 2:02am.

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 thats 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

good work.

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