Vhat is the value of a in the equation 3 a+b=54, when b = 9?
O 15
O 18
O 21
0 27

What are the solutions of the system? solve by graphing. y = -x^2 -6x - 7 y = 2

Starting at home, emily traveled uphill to the hardware store for 606060 minutes at just 666 mph. she then traveled back home along the same path downhill at a speed of 121212 mph. what is her average speed for the entire trip from home to the hardware store and back?

Asmall book publisher knows that 26 books weigh 41 lbs. how much do 40 books weigh?