You're going to need the pythagorean theorem, which is a^2+b^2=c^2. 15^2 is 225, 17^2 is 289, and if you work out the equation you get to an answer of 8 inches.
Answer:
For E, each angle is 60° because its an equilateral triangle.
F is 45° for x, 135° for y, lastly z is 22.5°
7u^3 - u^2 - 7 + 2u^3 - 4u^2
(7+2)u^3 -(1+4)u^2 - 7
9u^3 - 5u^2 - 7
12 x 2 = 24 (Julio), 24 x 4 = 96 (David).
Your are being asked to find what value of a will result in the denominator being 0, since you can not divide by 0 then this will be your non permissible value. Simply take the denominator(after it has been factored down and reduced, if necessary, it's not in this question though) then set to 0 and solve for the variable.



Therefore your non permissible value will be,
a ≠ 0