Peng Zhou khanacademy | Knowt

Home Explore Exams

8 Badges

1 day Streak

Level 21

1180 Coins

Peng Zhou

@khanacademy

Follow

1 Followers

2 Following

Exams

Materials

Exams

Materials

Get Knowt

Mobile App

Chrome Extension

School Pricing

Feedback

Student Plans

Teacher Plans

Knowt vs Quizlet

Knowt vs Fiveable

Study Tools

AI Flashcards

AI PDF Summarizer

AI Image Summarizer

AI PPT Summarizer

AI Video Summarizer

AI Lecture Note Taker

AI Spreadsheet Summarizer

Flashcard Maker

Exams

AP Exam Hub

IB Exam Hub

GCSE Exam Hub

A-Level Exam Hub

More Exam Hubs

Practice Test Room

Free-Response Room

AP Score Calculator

Resources

FAQ

Contact Us

Blog

DMCA Takedown

Privacy Policy

COPPA Notice

Terms of Service

Privacy Manager

Subjects

Science

Social Studies

Language

Math

Engineering

Business

© 2026 Knowt Inc.

Advanced Placement® AP®, and SAT® are trademarks registered by the College Board, which is not affiliated with, and does not endorse, this product. ACT® is a trademark registered by the ACT, Inc, which is not affiliated with, and does not endorse, this product.