8.SP.A.3 math practice. Learn by doing.

A line of best fit for the number of lawns Jaden mows $x$ and his savings $y$ in dollars is $y = 15x + 40$. According to the line, how many dollars did Jaden have saved before mowing any lawns?

A trend line for hours studied $x$ and quiz score $y$ is $y = 4x + 62$. What score does the line predict for a student who studies $3$ hours?

A trend line predicts that a bakery will sell $75$ bagels on Monday. The bakery actually sells $79$ bagels. What is the residual (actual value minus predicted value)?

A line of best fit relating hours of practice $x$ to free throws made $y$ is $y = 6x + 10$. According to the line, each additional hour of practice adds about how many free throws?

A trend line for the daily high temperature $x$ in degrees and cups of lemonade sold $y$ is $y = 2x - 60$. For a predicted $100$ cups sold, what should the temperature be?

A trend line for the number of car washes a club holds $x$ and the club's funds $y$ in dollars is $y = 75x + 120$. According to the line, how many dollars did the club have before holding any car washes?

A trend line for miles jogged $x$ and calories burned $y$ is $y = 90x + 20$. How many calories does the line predict for a $4$-mile jog?

A trend line predicts Mia will spell $18$ words correctly in a spelling bee. She actually spells $21$ words correctly. What is the residual (actual minus predicted)?