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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, interactive explorations.

Used and loved by over 6 million people

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

Fratelli bianco Lazu Rossetti Tango 23759
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Marie shops at a store where all prices end in 99 cents ($0.99, $1.99, $2.99, etc.). She ends up spending $33.89.

How many items did she purchase?

Fratelli Rossetti Lazu Tango bianco 23759

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by Victor Paes Plinio

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Measuring sticks of various lengths are hinged at the edge of a table, with a fingertip supporting the stick somewhere along the stick's length.

When is the force applied by the fingertip the greatest?

Details and Assumptions:

  • All measuring sticks are made of the same material and have the same width and thickness.
  • All measuring sticks are divided into segments.
by Rohit Gupta

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These images show the same part of the night sky as seen in January and July 2018. Most of the stars have remained fixed, though two seem to have moved relative to the others.

23759 Fratelli Tango bianco Lazu Rossetti Which star is closer to us, red or blue?

Assume that the red and blue stars have not moved significantly relative to the Sun in the time between the two images were taken.

by Pranshu Gaba

bianco Fratelli Lazu Tango 23759 Rossetti Are you sure you want to view the solution?

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Rossetti Fratelli 23759 Lazu bianco Tango Out of a group of students, 60% are taking mathematics, 65% French, and 75% German, but none are taking all 3 subjects.

Is there a student who is taking neither French nor German?

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are integers satisfying One possible solution is

How many other solutions are there?

by Rossetti Tango bianco Lazu 23759 Fratelli bianco Tango Rossetti Lazu 23759 Fratelli Pi Han Goh

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Product type Loafers
Ref. 167374
Season Spring/Summer
Width Standard
Construction Vulcanized
Colour White
Heel height 3.5 cm
Lining Leather
Upper/Ankle Leather
Sole type Removable inner sole
Insole Leather
Outer sole Synthetics
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