Expert: Sherman D. - 4/4/2005

Question
hi my name is Tina and these are some problems just dont know how to do these are the 4 I dont know how to do.Algebra One
1.simplify the expression : (12m + 4n) + (3m + 7n)
2.Austin has 42 paper back books that are either mysteries or science fiction.If he has 16 more mysteries than science fiction books, how many mysteries does he have?
3.Hue put $450 into an account that pays interest at an annual rate of 3%.How much will her account have in two years?
4.Evaluate 3xz - 8y if x = 4, y = -1 and z = -2

Answer
1.)
(12m + 4n) + (3m + 7n)
12m + 4n + 3m + 7n
(12 + 3)m + (4 + 7)n
15m + 11n

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2.)
m = mysteries
s = science

m = s + 16

m + s = 42

(s + 16) + s = 42
s + 16 + s = 42
2s + 16 = 42
2s = 26
s = 13

m = s + 16
m = 13 + 16
m = 29

29 Mystery Books
13 Science Books

ANS : 29

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3.)
A = P(1 + r)^t
A = 450(1 + .03)^2
A = 450(1.03)^2
A = 450(1.0609)
A = $477.405

ANS : $477.41

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4.)
3xz - 8y if x = 4, y = -1 and z = -2

3(4)(-2) - 8(-1)
3(-8) + 8
-24 + 8
-24 - (-8)
ANS : -16