Erics 4 test grades are 85, 75, 97, 93 . What must she make on her 5th test to have an average of 87?
(85 + 75 + 97 + 93 + x)/5 = 87
350 + x = 435
x = 85
how did you get 435?
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
Determine the values of x for which x-5/3x+6 is undefined�
To find out the score Eric needs to earn on her 5th test to have an average of 87, we can determine the total score she needs to achieve.
The average is calculated by summing all the scores and dividing by the number of tests. In this case, Eric has taken 4 tests and wants an average of 87.
So, Eric's average will be calculated as:
(85 + 75 + 97 + 93 + x) / 5 = 87
To solve for x, we multiply both sides of the equation by 5:
85 + 75 + 97 + 93 + x = 87 * 5
Now we can simplify and solve for x:
350 + x = 435
Subtracting 350 from both sides:
x = 435 - 350
x = 85
So, Eric needs to score 85 on her 5th test to have an average of 87.