Posted by **Please help!!!** on Tuesday, January 11, 2011 at 9:39pm.

Erics 4 test grades are 85, 75, 97, 93 . What must she make on her 5th test to have an average of 87?

- MATH -
**helper**, Tuesday, January 11, 2011 at 10:08pm
(85 + 75 + 97 + 93 + x)/5 = 87

350 + x = 435

x = 85

- MATH -
**Please help!!!**, Tuesday, January 11, 2011 at 10:23pm
how did you get 435?

- MATH -
**helper**, Tuesday, January 11, 2011 at 10:30pm
to get rid of the denominator ( 5 ), multiply both sides of the equation by 5/

so, 5 cancels out of the left side and

5 * 87 = 435 on the right side

- MATH -
**Bianca **, Tuesday, August 9, 2011 at 7:25pm
Determine the values of x for which x-5/3x+6 is undefined

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