Answer:

Step-by-step explanation:
we know that
The total area of the figure is equal to the area of the square plus the area of the triangle
step 1
Find the area of triangle
The area of triangle is equal to

where
b is the base of triangle (is the same that the length side of the square)
h is the height of triangle
we have

Applying the Pythagorean Theorem
Find the length side b




Area of triangle

step 2
Find the area of the square
The area of the square is

we have

substitute

step 3
Find the total area of the figure
Adds the areas

8.75 x 37.5= ? Well all you do is have to line up the decimals and work it out! :) it's simple
A(n)=a(1)+d(n-1), d=a(16)-a(15)=-5-(-53)=48
a(15)=a(1)+d*(15-1),
-53=a(1)+48*(15-1),
a(1)=-53-48*14= -725
a(n)=-725+48(n-1)
The decimal point just moves to the right 1 digit.
Example:
100.000 ---> 10.000 ---> 1.000