I got D for the answer ...
Answer:
Part A:the sum of Side 1 and Side 2= 5x^2+7x-4 Part B all you have to do is the same thing, but subtract the sum of side 1 and 2 from the total. part c they are closed under subtraction.
Step-by-step explanation:
If you are talking about #5 then the mode is 7 because mode is the number that appears the most
Answer:
Part 1) 
Part 2) 
Part 3) 
Step-by-step explanation:
Part 1) Find the measure of angle ECF
we know that
CF is tangent at point C
so
the radius EC is perpendicular to the tangent CF
therefore

Part 2) Find the measure of angle AKB
we know that
The measure of the interior angle is the semi-sum of the arcs comprising it and its opposite

substitute the values

Part 3) Find the measure of angle ACF
we know that
The inscribed angle is half that of the arc it comprises

substitute the values
