The equation 9+3a-4-=?a+20-15 has infinitely many solutions. What value should be placed in the box?

Match the term on the left with its image or description on the right. match term definition diameter a) circle a and a line segment connecting points b and c which are on the circle. circumference b) circle a and a line segment connecting points b and c which are on the circle. radius c) a piece of the circumference of a circle secant d) two circles that share the same center. concentric circles e) the distance around a circle arc f) a segment between two points on a circle that passes through its center

The angle of a triangle are given as 6x,(x-3), and (3x+7). find x then find the measures of the angles

Arectangle has a width of 5 cm and a length of 10 cm. if the width is increased by 3, how does the perimeter change?