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Word problems
In 1994, the life expectancy of males in a certain country was 72.4 years. In 2000 it was 74.5. Let E represent the life expectancy in year t and let t represent the number of years since 1994. The linear equation that fits is E(t)= _t + _ please round to the nearest tenth.
Then use the equation to predict the life expectancy of males in 2003
E(9) =
Trains A and B are traveling in the same direction on parallel tracks. Train A is traveling at 40 mph and Train B at 60 mph. Train A passes a station at 9:15pm, if train B passes the same station at 9:27 pm at what time will train B catch up to train A?
The width of a rectangle is fixed at 18cm. What lengths will make the perimeter greater than 76 cm?
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Solution Summary
This provides examples of writing equations and solving word problems.
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In 1994, the life expectancy of males in a certain country was 72.4 years. In 2000 it was 74.5. Let E represent the life expectancy in year t and let t represent the number of years since 1994. The linear equation that fits is E(t)= _t + _ please round to the nearest tenth.
Supposed t at 1994 is = 0. Then, we know that E(t=0) = ax+72.4
Now, it ...
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