Math 1 · Unit 10 · Lesson 4 · part 4 of 4
Practice Problems
Try them, get help one step at a time, then print how it went.
Practice: try it, then get help one step at a time
Choose the family, read a and b in the story, and answer a when-will-it-reach question. Hint gives a nudge, Show next step shows one worked step at a time with the calculator keys, Reveal answer checks, and Hide help / start over clears the card.
My results
Finished the practice? Print a page that shows each question, what you typed or chose, the correct answer, and how it went. Good for showing a teacher or keeping in a folder.
Exit ticket
On paper or an index card. Use the math word and the plain-English word.
- How do you decide between a line and an exponential for messy data?
- A model is y = 20 · 1.25x, x in days. What do 20 and 1.25 mean?
- A model is y = 348 · 0.49x. Growth or decay? What percent is kept each step?
- The pennies started at 300, but the model's a is 348. Why?
Check your exit ticket
- Roughly constant differences: a line. Roughly constant ratios and a bending plot: an exponential.
- About 20 at the start; it grows about 25% each day.
- Decay: about 49% is kept, about 51% is lost.
- Regression fits all the points, and random coin flips make real data wobble.