Step-by-step explanation:
a)6!+12-3
=6!+9
b)-18+3!+4
=3!-14
=3!+(-14)
both are in the form if (+)!+constant.
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b = 3
500a + 1500(3) = 15000
500a + 4500 = 15000
500a = 10500
a = 21
She can buy 21 older games
Besides just using the math in everyday life, it is also used in newspapers.
8/40=x%
x%=x/100
8/40=x/100
1/5=x/100
100=5x
divide both sides by 5
20=x
answer is 20%