Part 1) According to one mathematical model, the average life expenctancy for American men born in 1900 was 55 years. Life expectancy has increased by about 0.2 year for each birth year after 1900. If this trend continues, for which birth year will the average life expentancy be 75 years? a) Write an equation to model the problem. Let t represent the number of years after 1900. For example, t = 12 would represent the year 1912. Answer: b) Solve the equation, then answer the question given above. (Note: You are asked for a year, not a value for t.) Part 2) Wilma drove at an average speed of 50 mi/h from her home in City A to visit her sister in City B. She stayed in City B 25 hours, and on the trip back averaged 35 mi/h. She returned home 48 hours after leaving. How many miles is City A from City B
Equations and Inequations
Equations and inequalities describe the relationship between two mathematical expressions.
Linear Functions
A linear function can just be a constant, or it can be the constant multiplied with the variable like x or y. If the variables are of the form, x2, x1/2 or y2 it is not linear. The exponent over the variables should always be 1.
Part 1) According to one mathematical model, the average life expenctancy for American men born in 1900 was 55 years. Life expectancy has increased by about 0.2 year for each birth year after 1900. If this trend continues, for which birth year will the average life expentancy be 75 years?
a) Write an equation to model the problem. Let t represent the number of years after 1900. For example, t = 12 would represent the year 1912.
Answer:
b) Solve the equation, then answer the question given above. (Note: You are asked for a year, not a value for t.)
Part 2)
Wilma drove at an average speed of 50 mi/h from her home in City A to visit her sister in City B. She stayed in City B 25 hours, and on the trip back averaged 35 mi/h. She returned home 48 hours after leaving. How many miles is City A from City B
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