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Magazine Problem 82
Perform each indicated operation. $$ \left(-\frac{3}{8}-\frac{2}{3}\right)-\left(-\frac{9}{8}-3\right) $$
Problem 82
A mathematical model is an equation that describes the relationship between two quantities. For example, the life expectancy at birth of Americans can be approximated by the equation $$ y=0.212 x-347 $$ where \(x\) is a year between 1943 and 2005 and \(y\) is age in years. (Source: Centers for Disease Control and Prevention.) Use this model to approximate life expectancy (to the nearest tenth of a year) in each of the following years. (IMAGE CANNOT COPY) $$ 1960 $$
Problem 82
Write each statement in words and decide whether it is true or false. $$ 6 \geq 12 $$
Problem 83
A mathematical model is an equation that describes the relationship between two quantities. For example, the life expectancy at birth of Americans can be approximated by the equation $$ y=0.212 x-347 $$ where \(x\) is a year between 1943 and 2005 and \(y\) is age in years. (Source: Centers for Disease Control and Prevention.) Use this model to approximate life expectancy (to the nearest tenth of a year) in each of the following years. (IMAGE CANNOT COPY) $$ 1985 $$
Problem 83
Write each statement in words and decide whether it is true or false. $$ 15 \leq 15 $$
Problem 83
Perform each indicated operation. $$ \left(-\frac{1}{2}+0.25\right)-\left(-\frac{3}{4}+0.75\right) $$
Problem 84
Write each statement in words and decide whether it is true or false. $$ 21 \leq 21 $$
Problem 84
Perform each indicated operation. $$ \left(-\frac{3}{2}-0.75\right)-\left(0.5-\frac{1}{2}\right) $$
Problem 85
Write each word statement in symbols. Fifteen is equal to five plus ten.
Problem 85
Perform each indicated operation. $$ -9+[(3-2)-(-4+2)] $$
