Algebra help please (1 Viewer)

[Tecumseh]

A student's grade in a course is the average of 4 test grades and a final exam that is worth four times as much as each test. Suppose a student has test grades of 89, 90, 75, and 90. Write an equation to model this situation where x is the student's grade on the final exam and y is the student's average for the course.

Then find the score they will need to receive on their final exam if they want to have a grade of 88 for the course.

Final exam score needed=___________________ =

 

[Gator Shawn]

(354 + 4x) / 8 = y

(354 + 4x) / 8 = 88

354 + 4x = 88 * 8

354 + 4x = 694

4x = 340

x = 340 / 4

x = 85, you would need an 85 on the final.

Did I pass?

 

[grateful zed]

what's in it for me?

 

[the moops]

4 times as much as each test.

should be 88.5 I think

But I am kinda drunk

 

[Bob Loblaw]

Final needs to be 90.

 

[Tecumseh]

(354 + 4x) / 8 = y

(354 + 4x) / 8 = 88

354 + 4x = 88 * 8

354 + 4x = 694

4x = 340

x = 340 / 4

x = 85, you would need an 85 on the final.

Did I pass?

Almost. The sum of the tests was 344, not 354, so the final needed to be 90, not 85.

How did you figure that you needed to divide by 8?

ETA- nm, I see it now. Thanks!

 

[grateful zed]

i get 89, but im kinda stoned.

 

[Bob Loblaw]

(354 + 4x) / 8 = y

(354 + 4x) / 8 = 88

354 + 4x = 88 * 8

354 + 4x = 694

4x = 340

x = 340 / 4

x = 85, you would need an 85 on the final.

Did I pass?

Almost. The sum of the tests was 344, not 354, so the final needed to be 90, not 85.

How did you figure that you needed to divide by 8?

Final = 4x as much as each test

 

[YSR]

Thought you were on teh honor rolls.

 

[Tecumseh]

Thought you were on teh honor rolls.

Haven't had to take math yet. Why do you think I was reveling while I could?

 

[Bob Loblaw]

Test 1: 89

Test 2: 90

Test 3: 75

Test 4: 90

Final (90x4): 360

Total: 704

Average: 704 / 8 = 88

 

[Ilov80s]

This also works:

0.125(344)+ 0.5x = y

Basically y=x/2 + 43 if you wanted to graph it

 

[BroadwayG]

Is the student male or female?

 

[gianmarco]

(86 + x)/2 = Y

 

[Maik Jeaunz]

the answer is to flirt with the nerdy girl in class, then steal her answer.

 

[Ilov80s]

Any particular form the teacher wants it in? It really should be in slope intercept or standard, we aren't barbarians.