To find out the cost of the spikes, we must isolate the variable.
first, subtract 8 from both sides.
S/2 +8 = 54 -8. -8
Now we have S/2 = 46
now, to find out what s is on its own, we must multiply by the recipricle of S/2. if that doesn't make sense to you, just think of it as cancelling the division by multiplying by 2.
It would take them about 129.9 hours to deliver all of the paper, because if you divide 44 by 52 you get 0.846153... now multiply that by 150 and you get 129.9230... Now round that to the nearest tenth which is 129.9.
