To solve 2x + 9 = 21, what is the first step?
A. Dividing each side by 2
B. Dividing each side by x
C. Subtracting 21 from each side
D. Subtracting 9 from each side

The table represents a function. what is f(-2)? a.-3 b. -1 c.1 d.3

The construction of copying qpr is started below. the next step is to set the width of the compass to the length of ab. how does this step ensure that a new angle will be congruent to the original angle?

How is this equation completed? i cannot find any examples in the book.