Lianna saves $25 every month in her savings account. She took out $100 on time to go shopping. She now has $450 in her account. Write and solve an equation to determine how many months Lianna has been saving money.
25m - 100 = 450; m= 22 months
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10
-6y + 12 = -66
y=13
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10
d/4 - 7 = -8
d= -4
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10
9 = -3y + 12
y = 1
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20
A waiter earned $3 an hour and $45 in tips. The total amount he made was $60. Write and solve an equation to determine how many hours he worked.