28A + 17C = 6010
A = 160
28(160) + 17C = 6010
4480 + 17C = 6010
17C = 6010 - 4480
17C = 1530
C = 1530/17
C = 90...so there were 90 children that attended
When y=0, t=1
so after 1 second the hammer land on the ground.
In the original expression there are 6 terms in the simplyfied one there are only 3
In the simplified expression coefficient of x is (-2)