Question 56001
Heather received grades of 80, 75, and 86 on three algebra tests. What must her grade be on the next test if her average for the four tests is to be at least 82?
:
Let x = the grade needed to raise her average to at least 82
:
{{{(x + 80  + 75 + 86)/4}}} => 82
:
Mut equation by 4, get rid of the denominator
x + 80 + 75 + 86 => 4(82)
:
x + 241 => 328
:
x => 328 - 241
:
x => 87 to get at least an 82 average