Answer:
X=5
Y=6
Step-by-step explanation:
9x-7y=3
x-7y=-37 |(-1)
9x-7y=3
-x+7y=37 +
________
8x=40
X=5
X=5
x-7y=-37
5-7y=-37
-7y=-42 |(-1)
7y=42
y=6
Looks to me like ur sales tax is 9% and ur instant rebate is 30 bucks
Answer:
X=2
Step-by-step explanation:
2 x 2 x 2 = 8
Answer:
d. 0.0023
Step-by-step explanation:
Calculation for the probability of getting a sample average of 1.8 or less
Using this formula
z score =(X-mean)/Standard errror
Where,
Standard error =Standard deviation/√(n)
Let plug in the formula
P(Xbar<1.8)=P(Z<(1.8 hours per day -2.2 hours per day)/(2 hours /√(200))
P(Xbar<1.8)=P(Z<-0.4/(2/14.14))
=P(Z<-0.4/0.1414)
=P(Z<-2.83)
Now let find the Z score of P(Z<-2.83) using the z table
P=0.0023
Therefore the probability of getting a sample average of 1.8 or less is:0.0023