Which of the following equations should be used to solve the following problem: cos x = 5/18 a: x=cos^-1 8/15
b: x=8/cos15
c: x=15cos8
d: 18cosx=5

PLEASE HELP!! WILL AWARD BRAINLIEST

Its due ! write an equation in which the quadratic expression 2x^2-2x 12 equals 0. show the expression in factored form and explain what your solutions mean for the equation. show your work.

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