You multiply by the conjugate to both the denominator and numerator.
After that you can simplify by canceling the 4 and then you are able to simplify the (h) as well.
Answer:
or 
Step-by-step explanation:
Given:
A semicircle.
To find:
Arc length of the semicircle = ?
Solution:
Formula for angle subtended by an arc on the center of circle is given as:

where
is the arc length and
is the radius of semicircle.
Angle of full circle is 
So, angle of semicircle = 
Using the formula, we can see that:


So, the answer is:
Arc Length of semicircle =
or 
10 ≤ x ≤ 30, x < 2y, x < 40.
Solution:
Given x is the number of graphing calculators produced daily and
y is the number of scientific calculators produced daily.
Step 1: A company produce atleast 10 and not more than 30 graphing calculators per day.
⇒ 10 ≤ x < 30
Step 2: Each day, the number of graphing calculators cannot exceed twice the number of scientific calculators produced.
⇒ x < 2y
Step 3: The number of scientific calculators cannot exceed 40 per day.
⇒ x < 40
Hence, the constraints are 10 ≤ x ≤ 30, x < 2y, x < 40.
Using the law of sines to solve the triangle if..
Answer: 3 2/3
2 1/
5 divided by 3/5 = 11/5 divided by 3/5 = 11/5 x 5/3 = 11 x 5, 5 x 3 = 55/15 = 55 divided by 5, 15 divided by 5 = 11/3 = 3 2/3