Step-by-step explanation:
9 boys/15 girls 3*3=9 3*5=15
6 boys/10 girls 3*2=6 2*5=10
27 boys/45 girls 3*9=27 9*5=45
500*4 = 2,000. Since his savings account earns 4% simple interest annually he would have 2000 in his account after 3 years since he didn’t make any deposits or withdrawals.
2a because you are added the same thing together... making it 2a