Careful! Duck!

Calculus Level 3

Min, the perfectly spherical duck, is happily picking up cubical seeds to eat. He grows in volume at a rate of 9 cubic feet per day. When Min's radius is 7 feet, at what rate (in square feet per day) is his surface area growing at that instant?

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Community

100 Day Summer Challenge

Careful! Duck!

Excel in math and science

Master concepts by solving fun, challenging problems.

It's hard to learn from lectures and videos

Learn more effectively through short, conceptual quizzes.

Our wiki is made for math and science

Master advanced concepts through explanations, examples, and problems from the community.

Used and loved by 4 million people

Learn from a vibrant community of students and enthusiasts, including olympiad champions, researchers, and professionals.

Master advanced concepts through explanations,
examples, and problems from the community.

Learn from a vibrant community of students and enthusiasts,
including olympiad champions, researchers, and professionals.

Master advanced concepts through explanations,
examples, and problems from the community.

Learn from a vibrant community of students and enthusiasts,
including olympiad champions, researchers, and professionals.