The answer is −10d4+17d2s−6s2
The mean of n numbers is the sum of the numbers divided by n.
You have a mean score of 84 after taking 5 tests. Let x be the sum of scores.

You scored a total of 420 points on five tests.
You need to have a mean score of 85 after taking 6 tests. Let y be the score you need to obtain. Your total score on 6 tests is 420+y.

You need to score 90 points on the sixth test.
Answer:
B
Step-by-step explanation:
Answer:
Im a soccer goalie too
Step-by-step explanation: 21/25, 0.84, 84%
To solve these questions, use this formula:
X3= F(X1-X2)
Y3= F(Y1-Y2)
Where X3 is the X value in the coordinate your solving for, F is the fraction, X1 is the first X and X2 is the second X
Plug in your numbers to fit this:
X3= 1/4 x (0--2)
Y3= 1/4 x (4- -3)
By solving you get:
(-.5, 1.75)