<u>ANSWER</u>
<u>EXPLANATION</u>
A quadratic equation is said to be in standard form when it is in the form
where a, b, c are real numbers.
The given quadratic equation is
When we add 6 to both sides, we obtain,
Or
This is what Alexandra got after he wrote the quadratic equation in standard form.
By comparing this equation to
we have a=1, b=4 and c=5.
Answer:
Variance of difference between pre-exam and post-exam grades = 10.8
Step-by-step explanation:
Correlation (X,Y) = Covariance (X,Y) / √ { Variance (X) . Variance (Y) }
Given : Correlation (Pre & post exam grade) = 0.9 ; Variance (Pre exam grade) = 0.90 ; Variance (Post exam grade) = 16
So, 0.9 = Covariance (X,Y) / √ { 16 x 9 }
0.9 = Covariance (X,Y) / 12
Covariance (X,Y) = 12 x 0.9 = 10.8
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Answer:
-57
Step-by-step explanation:
f(-8)=6(-8)-9
f(-8)=-48-9
f(-8)=-57