Question 4- is 32.25
question 5- is 12.4
question 6 -is 14/17
question 7 - is 10.7
<span>(2 + 5i)(2 + i)
= 4 + 10i + 2i + 5i^2
= 4 + 12i + 5i^2</span>
We multiply by 4 to go from a denominator of 7 to 28 so we must do that do the numerator as well:

Answer: 8/28
6/100+11/100+19/100= 36/100. 36/100 in simplest form is 9/25
Answer:

Step-by-step explanation:
First, calculate the area of the rectangle.
Here, length = 18 units and Width = 12 units
The formula for calculating the area of the rectangle is 

The radius of the semi-circle is 6 units.
The formula for calculating the area of the semi-circle is
.

The area of the shaded region is equal to the difference of area of the rectangle and area of the semi-circle.
