Answer:
3x^4-13x^3-x^2-11x+6
Step-by-step explanation:
Checked this on a website for you btw!
By using Pythagoras theorem.. the angle is 53 degree(rounded to the nearest angle).. so x degree =53 degree
To find the interior angle of any regular polygon you can use the formula

where n is the number of sides
So,

The measure of an interior angle in a regular octagon is 135
$8 per swimming lesson.
$20 registration fee.
$52 - $20 = $32.
$32 ÷ $8 = 4.
spent 4 hours teaching lessons