Solve the quadratic equation using the quadratic formula. Express the solution in standard form.5x2 = -9x - 7
A. 
B. 
C. 
D. 
Answer: D
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Determine whether or not one or more pairs of twin primes exist between the pair of numbers given. If so, identify the twin primes.30 and 51
A. 43, 47 B. No C. 41, 43 D. 41, 42 and 47, 49
Provide an appropriate response.Explain what is wrong with this first step in the solution process for the equation 
3x + 10 = 3x + 7
What will be an ideal response?
Factor the trinomial completely. If the polynomial cannot be factored, write "prime."x2 + 3x - 18
A. (x + 6)(x - 3) B. prime C. (x - 6)(x + 1) D. (x - 6)(x + 3)
Suppose ABC is a right triangle with sides of lengths a, b, and c and right angle at C. Find the unknown side length using the Pythagorean theorem and then find the value of the indicated trigonometric function of the given angle. Rationalize the denominator if applicable.Find cos A when a = 9 and b = 7.
A. 
B. 
C. 
D. 