Me ajudem!

f(x) = 2x + 4

para f(5)

There are 15 plates and each plate is either 7 or 12 inches diameter. which systems of equations do you use to find the number of 7 inch plates, x and 12 inch plates, y

Which value of m will create a system of parallel lines with no solution? y= mx - 6 8x - 4y = 12

Ametal rod is 2/5 meters long. it will be cut into pieces that are each 1/30 meters long. how many pieces will be made from the rod?