When dividing whole numbers and decimals how do you decide where to place the first digit of the quotient

Marcus needs to rewrite f(x) = x2 + 6x + 4 in vertex form.

If x is 6, then 7x= a. 13 b. 42 c. 42x d. 76

The function y= x - 4x+ 5 approximates the height, y, of a bird, and its horizontal distance, x, as it flies from one fence post to another. all distances are in feet. complete the square to find and interpret the extreme value (vertex). select two answers: one extreme value and one interpretation.