Answer:
D. x = 12, y = -8.
Step-by-step explanation:
x + y = 4......(1)
2x + 3y = 0......(2)
Multiply equation (1) by -2:
-2x - 2y = -8 .....(3)
Add (2) + (3):
y = -8
Substitute y = -8 into equation (2):
2x + 3(-8) = 0
2x - 24 = 0
2x = 24
x = 12.
Check the results in equation (1).
x + y = 4
12 + -8 = 4
They check out OK.
Answer:
Step-by-step explanation:
is this edge?
If it is, my friend had the same question i think. I didn't tho
-4 is the y intercept, then go down -5/6 and then right 1.
Hopefully it helps and that's right haha
Step-by-step explanation:
A.
Null hypothesis
H0: σ1² ≤ σ2²
Alternative hypothesis
H1: σ1² > σ2²
We have level of significance = 0.01
Test statistic
F = S1²/S2²
= 170²/100²
= 28900/10000
F = 2.89
Df = degrees of freedom
Df1 = n1 - 1
= 26-1
= 25
Df2 = n2 - 1
= 25-1
= 24
B. We get the p value using f distribution
Fdist(2.89,25,24)
P value = 0.0057
The p-value is less than 0.01 so we reject null hypothesis.
So we conclude that automobiles that are of 4 years have their variances to be larger In annual repair costs than those that are of 2 years.
Reasonableness: we expect this since 4byears old automobiles are more likely to have more expenses during repair leading to greater variances
Answer:
adding 2 to each number
Step-by-step explanation:
7 +2 = 9 + 2 = 11