A letter or symbol that represents a number (quantity) that can change

Sienna planned a trapezoid-shaped garden, as shown in the drawing below. she decides to change the length of the top of the trapezoid-shaped garden from 32 ft to 24 ft. which expression finds the change in the scale factor?

Plot a point at the y-intercept of the following function on the provided graph. 3y=-5x+7 20 points

Which of the following circles have their centers on the x-axis? check all that apply.