Exponential growth and decay Quiz
10 questions · easy to harder · Algebra 1 · score and step-by-step answers
How it works
- 10 questions, about 20 minutes (a timer counts down; you can hide it). Solve it right here: no sign-up.
- 5 questions have choices. For the others you type the answer: a number like 4, −2, 7/2 or 3.5, or for example x = 4, x = 2 or x = −3, (3, 5), 2x + 1. Use ^ for powers (x^2) and sqrt for √. Any form with the same value counts (7/2 = 3.5).
- One question at a time: Back, Next, Mark for review and the question list at the bottom. A calculator is on the screen.
- At the end: your percent and grade, every question right or wrong, why a wrong choice is wrong, and its step-by-step solution. Then practise the lesson with new questions.
Your answers and results are kept in this browser only, so you can close the page and come back.
1 Question 1
200 bacteria double every hour. How many are there after 5 hours?- A) 200
- B) 2
- C) 2000
- D) 6400
2 Question 2
80 mg of a medicine halves every hour. How much is left after 3 hours?Type the answer.
3 Question 3
$1000 grows by 5% a year. How much is it after 3 years?- A) $1157.63
- B) $1000
- C) $1157630
- D) $1150
4 Question 4
A car worth $20000 loses 15% of its value each year. What is it worth after 3 years?Type the answer.
5 Question 5
A town of 5000 people grows by 10% a year. How many people live there after 2 years?- A) 6000
- B) 5000
- C) 605000
- D) 6050
6 Question 6
A bike worth $800 loses 25% of its value each year. What is it worth after 2 years?Type the answer.
7 Question 7
A lake has 6000 fish. The number falls by 20% each year. How many fish are there after 3 years?- A) 48
- B) 307200
- C) 6000
- D) 3072
8 Question 8
$2500 grows by 4% a year. How much is it after 5 years?Type the answer.
9 Question 9
A phone worth $600 loses 30% of its value each year. What is it worth after 2 years?- A) $29400
- B) $294
- C) $54
- D) $600
10 Question 10
A video has 50 views. The views double every day. How many views are there after 6 days?Type the answer.