Ms. Cook's class bought 2 bags of concrete and some bricks to build a border for their class garden. The bricks cost
$51. The total cost of the bricks and the concrete was $57.
Which equations can be used to find the cost, b, of 1 bag of
concrete?
o 2(51) + b = 57
o 2b + 51 = 57
O 2 + 51b = 57
ob + 51 = 57