$462
3/5 of 35 gallons = 21 gallons
21 gallons x $22 = $462
From the problem, the vertex = (0, 0) and the focus = (0, 3)
From the attached graphic, the equation can be expressed as:
(x -h)^2 = 4p (y -k)
where (h, k) are the (x, y) values of the vertex (0, 0)
The "p" value is the difference between the "y" value of the focus and the "y" value of the vertex.
p = 3 -0
p = 3
So, we form the equation
(x -0)^2 = 4 * 3 (y -0)
x^2 = 12y
To put this in proper quadratic equation form, we divide both sides by 12
y = x^2 / 12
Source:
http://www.1728.org/quadr4.htm
![\sqrt[7]{(7x^3y^2)^{2} } = \sqrt[7]{(49x^6y^4)}](https://tex.z-dn.net/?f=%20%5Csqrt%5B7%5D%7B%287x%5E3y%5E2%29%5E%7B2%7D%20%7D%20%3D%20%5Csqrt%5B7%5D%7B%2849x%5E6y%5E4%29%7D%20)
In a fractional exponent the denominator tells what root it is (7th root in this case) and the numerator tells what the value in the parenthesis is raised to (2nd power in this case)
If 1 inch represents 0.5 centimeter, then 28 inches will represent 28 * 0.5 = 14 centimeters and 15 inches will represent 15 * 0.5 = 7.5 centimeters.
The actual dimensions of the phone is: the length is 14 centimeters and the width is 7.5 centimeters.