Answer:
C. 
Step-by-step explanation:
Use formula for the area of trapezoid

where a is the smaller base, b is the larger base and h is the height.
From the diagram,

So, the area of trapezoid is

Answer:
The two squares are 81 and 100, and their difference is 19
For this case we have the following expression:

We must find the value of the expression when:

Substituting the values in the expression we have:

Thus, the value of the expression is 2.
Answer:
The value of the expression is 2
Option A
Answer:
Multiplication property of equality and subtraction property of equality
Step-by-step explanation:
Just using the signs to know what you can do to get your answer (also PEMDAS)
This question doesn’t really make sense but 3 of us figured out that the closest option is B 4f=45