Answer:
39.6 is the answer.
Step-by-step explanation:
280.5 - 240.9
Subtract :
280.5 - 240.9
= 39.6
Unit rate the the price for one thing, so we'll have to find the price for one ounce.

Just follow it:

It cost $.50 for one ounce.
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F(x) = x - 2sinx
To find for what values of x graph has tangents we need to differentiate function f(x).
f'(x) = 1-2cosx
Now, if we want to have horizontal tangents we need to make function f'(x) equal to 0 because at minimum or maximum of function f(x) tangent is horizontal.
1-2cosx = 0
cosx = 1/2
x = pi/3 + 2*n*pi and
x = -pi/3 + 2*n*pi
Explanation: cosx = 1/2 for both 60° and -60°. If we make one circle cosx will be equal to 1/2 for 420 and 300 degrees. Writing degrees in radians (using pi) we can write formulas above where 2*pi represents one full circle and n is an integer which represents how many circles we made.
180 degrees. in an equilateral triangle, each angle is 60 degrees