Answer:
B=210
C=450
Step-by-step explanation:
Since you are asking for number 8, let's work with that problem :)
Firstly, we have to know we have rectangles here, and the area of a rectangle is given by the following formula:
So, in this problem we are given as an example the rectangle , with witdth and height . So, its area is:
The same happens with the small rectangle :
And, we have to do the same with rectangles and :
<u>Rectangle :</u>
Width:7
Height:30
<u>Rectangle :</u>
Width:90
Height:5
If we sum , , and the result must be equal to the total are of the big rectangle:
Area of big rectangle with width and height :