Jada rewrites \(5 \boldcdot 3^x\) as \(15x\). Do you agree with Jada that these are equivalent expressions? Explain your reasoning.

Investment Account 1 starts with a balance of \$200 and doubles every year. Investment Account 2 starts with \$1,000 and increases by \$100 each year.

1. How long does it take for each account to double?
2. How long does it take for each account to double again?
3. How does the growth in these two accounts compare? Explain your reasoning.

A study of 100 recent high school graduates investigates a link between their childhood reading habits and achievement in high school.

Participants are asked if they read books every night with another person when they were ages 2 to 5, as well as their grade average for all of their high school classes. The results are represented in the table.

1. What does the 21 in the table represent?
2. What does the 10 in the table represent?

Lin says that a snack machine is like a function because it outputs an item for each code input. Explain why Lin is correct.

At a gas station, a gallon of gasoline costs \$3.50. The relationship between the dollar cost of gasoline and the gallons purchased can be described with a function. 

1. Describe the function with a sentence of the form "\(\underline{\hspace {0.5in}}\) is a function of \(\underline{\hspace {0.5in}}\)."
2. Identify an input-output pair of the function, and explain its meaning in this situation.