Write an expression in terms of x for the total cost of 3 pens and 3 rulers​

Me what is the value of x? showing work would be appreciated - ! : )

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?

Solve the triangle. a = 21°, c = 105°, c = 5