Thursday
October 23, 2014

Homework Help: m

Posted by deedra on Thursday, January 8, 2009 at 3:43pm.

Ok here are a few more

1. collect like terms
12r+6s-3r-9s
A:9r-3s

2. translate to an algebraic expression
The product of 46% and some number
A: y=0.46x

3. In 1993, the life expectancy of males in a certain country was 61.3 yrs. In 1999, it was 64.7yrs. Let E represent the life expectancy in year t and let t represent the number of years since 1993.

The linear function E(t) that fits the data is
A: E(t)=-0.03t+61.3
Use the function to predict the life expectancy of males in 2003.
A: E(10)=61.6

4. solve by substitution
3x+2y=12
x=52-6y
A: (-2,9)

5. solve by elimination
2r-7s=-31
7r+2s=24
A:(2,5)

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