Find out the determinant
we have
2x-y=4
3x+y=1
so
D=(2)(1)-(-1)(3)
D=2+3
D=5
therefore
<h2>the answer is the second option</h2><h2>Verify</h2>
solution (1,-2)
equation 1 -------> 2(1)-(-2)=4 -------> 4=4 is true -----> is ok
equation 2 ------> 3(1)-2=1 -----> 1=1 ----> is true -----> is ok
Answer:
2.1 divided by 12.8=0.172413
Step-by-step explanation:
0 0 0. 1 7 2 4 1 3
1 2 1 8 2 1 0. 0 0 0 0 0 0
− 0
2 1
− 0
2 1 0
− 0
2 1 0 0
− 1 2 1 8
8 8 2 0
− 8 5 2 6
2 9 4 0
− 2 4 3 6
5 0 4 0
− 4 8 7 2
1 6 8 0
− 1 2 1 8
4 6 2 0
− 3 6 5 4
9 6 6
Answer: 
Step-by-step explanation:
Given : sample size : n= 51
sample standard deviation : s= 0.46
Significance level : 
Using chi-square distribution, the critical values will be :
Confidence interval for population standard deviation (
) :
Substitute all the values , we get
Hence, the 95% two-sided confidence interval for σ :
Answer:
(24-4.00)-4.50/20
Step-by-step explanation: 24 minus 4 would be 20 and you could buy 4 phone cases because 20 divided by 4.50 is 4.4 so 4 times 4 is 16 plus the 2.00 dollars extra from the .50 in the 4.50 so it would be you can buy 4 phone cases.
