3x^2+5x-12 solved by using quadratic formula

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Step-by-step explanation:

3x^2 + 5x - 12

To solve it, you need an equation, so I think you mean this equation.

3x^2 + 5x - 12 = 0

Using the quadratic formula, you have a = 3, b = 5, c = -12.

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the sum of all the angles in a triangle are equal to 180

so you can add   the 3 given angles together to equal 180:

5y + 2y + 2y = 180

or since all three angles have the same letter, combine the 3 angles to equal 180:

9y = 180

11 feet 6 inches and 8 feet 6 inches