100% because

is 6 and

is 9 meaning that the sum will come up at 6 or 9 also meaning that its 100%
Answer:
see the procedure
Step-by-step explanation:
we know that
The scale factor of the model is 1/30
That means ----> 1 unit in the model represent 30 units in the actual
so
using proportion
Find out how much represent 5 ft in the model
Convert feet to inches
Remember that

so

Let
x -----> the diameter of the circular window in the model house in inches

Simplify

therefore
The diameter of the circular window in the model house is 2 inches
see the attached figure to better understand the problem
Answer:
102= 72x; x = around 1.42
Step-by-step explanation:
To find the difference of the given expression, first step is to get rid of parenthesis. So, distribute negative sign to each terms of the second parenthesis. Hence,
(9x² + 10x + 4) - (9x² + 5x - 1)
= 9x² + 10x + 4 - 9x² - 5x + 1.
= (9x² - 9x²) +(10x - 5x) + (4 + 1) Group the like terms.
= 0 + 5x + 5 Combine the like terms.
= 5x + 5.
So, first choice is correct.
Hope this helps you!