Recent studies indicate that the average surface temperature of the earth has been rising steadily. Some scientists have modeled the temperature by the linear function T = 0.02t + 8.50, where T is temperature in °C and t represents years since 1900. What do the slope and T-intercept represent?

Recent studies indicate that the average surface temperature of the earth has been rising steadily. Some scientists have modeled the temperature by the linear function T = 0.02t + 8.50, where T is temperature in ${ }^{\circ} \mathrm{C}$ and t represents years since 1900.

Use the equation to predict the average global surface temperature in 2100.

Which function belongs to both families?

At the surface of the ocean, the water pressure is the same as the air pressure above the water, 15 lb/in^2. Below the surface, the water pressure increases by 4.34 lb/in^2 for every 10 ft of descent. Express the water pressure as a function of the depth below the ocean surface.

Recent studies indicate that the average surface temperature of the earth has been rising steadily. Some scientists have modeled the temperature by the linear function $T=0.02 t+8.50$, where $T$ is temperature in ${ }^{\circ} \mathrm{C}$ and $t$ represents years since $1900$. What do the slope and $T$-intercept represent?

Three runners compete in a 100-meter hurdle race. The graph depicts the distance run as a function of time for each runner. Describe in words what the graph tells you about this race. Who won the race? Did each runner finish the race? What do you think happened to runner B?

Recent studies indicate that the average surface temperature of the earth has been rising steadily. Some scientists have modeled the temperature by the linear function $T=0.02 t+8.50,$ where T is temperature in $^{\circ} \mathrm{C}$ and t represents years since 1900. What do the slope and T-intercept represent?

What do all members of the family of linear functions f(x) = c - x have in common? Sketch several members of the family.

Find an equation for the family of linear functions such that f(2)=1 and sketch several members of the family.

A cell phone plan has a basic charge of $35 a month. The plan includes 400 free minutes and charges 10 cents for each additional minute of usage. Write the monthly cost C as a function of the number x of minutes used and graph C as a function of x for 0 ≤ x ≤ 600.

Find an equation for the family of linear functions with slope 2 and sketch several members of the family.

Blood alcohol concentration Researchers measured the blood alcohol concentration (BAC) of eight adult male subjects after rapid consumption of 30 mL of ethanol (corresponding to two standard alcoholic drinks). The table shows the data they obtained by averaging the BAC (in mg / mL ) of the eight men.

Use your graph to describe how the concentration of alcohol varies with time.

Sketch the graph of the amount of a particular brand of coffee sold by a store as a function of the price of the coffee.

Researchers measured the blood alcohol concentration (BAC) of eight adult male subjects after rapid consumption of 30 mL of ethanol (corresponding to two standard alcoholic drinks). The table shows the data they obtained by averaging the BAC (in mg/mL) of the eight men. Use the readings to sketch the graph of the BAC as a function of t.

$$\begin{matrix} \text{t (hours)} & \text{0.0} & \text{0.2} & \text{0.5} & \text{0.75} & \text{1.0} & \text{1.25} & \text{1.5}\\ \text{BAC} & \text{0} & \text{0.25} & \text{0.41} & \text{0.40} & \text{0.33} & \text{0.29} & \text{0.24}\\ \text{t (hours)} & \text{1.75} & \text{2.0} & \text{2.25} & \text{2.5} & \text{3.0} & \text{3.5} & \text{4.0}\\ \text{BAC} & \text{0.22} & \text{0.18} & \text{0.15} & \text{0.12} & \text{0.07} & \text{0.03} & \text{0.01}\\ \end{matrix}$$