Which shows the equation and solution for this sentence?

sixteen is nine more than a number.

a. 16=9+n; n=7
b. 16=9+n; n=25
c. 16+n=9; n=7
d. 16+9=n; n=25

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? by using compass take the measures of angle and draw the same arc according to it.