The required answer is 10.5
I am answering the question assuming that you meant that the height was 13 1/2 feet.
Answer = 94.5 square feet
Step-by-step explanation: Area is calculated by multiplying the length x width.
Area = 7 x 13.5
Area = 94.5
A = amount invested at 4%.
b = amount invested at 9%.
we know the total amount invested was $26500, thus
a + b = 26500.
whatever% of anything is just (whatever/100) * anything.
how much is 4% of a? well, is just (4/100) * a, or
0.04a.
how much is 9% of b? well, is just (9/100) * b, or
0.09b.
we know the interest yielded for both amounts adds up to $1510, thus
0.04a + 0.09b = 1510.

how much was invested at 9%? well, b = 26500 - a.
You should use a protractor to help you with this answer; without one it's really hard to draw a 62 degree angle on your own. Sorry!!!
Observe that

In the original equation, divide both sides by
:


Next,

where
is any integer. Then

Fix
to ensure
, so that
