Answer:
15
Step-by-step explanation:
We assume you mean that ...
∠1 + ∠2 = 90°
60° + 2x° = 90° . . . . given values for the angles
2x° = 30° . . . . . . . . . .subtract 60°
x = 15
2n^2-8n=9
divide by 2
2(n^2-4n) =9
add (4/2)^2 =4 to each side completing the square
(n^2-4n+4 ) =9/2+4
(n-2)^2 = 9/2+8/2
(n-2)^2 =17/2
take the square root of each side
n-2 = +-sqrt(17/2)
add 2 to each side
n = 2+- sqrt (17/2)
Answer:2+ sqrt (17/2),2- sqrt (17/2)
Given:
The diameter of a circle = 20 feet
To find:
The exact circumference of the circle.
Solution:
We know that the radius is half of the diameter of the circle.
The diameter of a circle is 20 feet. So, the radius of the circle is 10 feet.
The circumference of the circle is:
Where, r is the radius.
Substituting 
, we get
Therefore, the exact circumference of the circle is 62.8 feet.
Note: All options are incorrect.
12% off of 32, because the price is lower than it would be if 17% was taken off of 35
14x + $609 = $1218
14x = 609
x = 43.5 hours more to have the rest of the money for the computer
