Which is an equation of a circle with center -5,-2 that passes through the point 3 4

Hiroaki wants to find 3 3/4 - 7/8 explain why he must rename 3 3/4 to do the subtraction.

In the polynomial below, what number should replace the question mark to produce a difference of squares? x2 + ? x - 36

The vertex of this parabola is at (-2,-3). when the x-value is -1, the y-value is -5. what is the coefficient of the squared expression in the parabola's equation?