Which expression is equivalent to —2/3(6x + 15)

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?

Kathy spent 5/8 of her money on books and another 1/6 of her money on stationeries.what fraction of kathy’s money was left?

How many sides does a regular polygon have if each exterior angle measure is 45 degrees explain your answer, i really don't understand this.