5,12,13 because a squared + b squared = c squared. 25 + 144 = 169 and 13 squared equals 168
You could buy 15 bags of mulch with $105.
To find the answer, plug in 0 for x since you aren't buying any bags of sand and then you have 7y=105 and divide by 7 to find y which is 15.

1. Remove the parenthesis using the next rules:

2. Start to remove the parentheses from the center to the edges:

<h2>Then, the solution is 8</h2>