A is the correct answer when you multip the same numbers you just summe the exp 4+8 = 12
.05c+.3s=10.25, c+s=100, c=100-s (c is for cards that don't sing and s is for those that do :P)
.05c+.3s=10.25 and c=100-s makes the equation become:
.05(100-s)+.3s=10.25
5-.05s+.3s=10.25
.25s=5.25
s=21, and since c=100-s
c=79
So she bought 21 of the more expensive singing cards...
A. $74.55
because if their are 4 pairs you would do 35x4=140 the half of 140 would be 70. Then they would have to pay tax witch is 6.5% of 70 and that is 4.55 so paying for the shoes and including tax would be 74.55
41,790 divided by 120 oranges = 199 trees remaining
