The answer is C due to the fact that 3^2 is 9 which is 9pi and its the same as 28.26
Answer:
D.
or 
Step-by-step explanation:
The given equation is:

Divide through by 3;

Add the square of half the coefficient of x to both sides.


The left hand side is now a perfect square:

Take square root



D.
or 
Answer:
-5
Step-by-step explanation:
From your knowledge of multiplication tables, you know that ...
-35 = -(7×5) = 7×(-5)
Then comparing to the given equation, you realize ...
t = -5
_____
Or, you can recognize 7 as the coefficient of t and divide both sides of the equation by that:
-35/7 = (7t)/7
-5 = t