Heidi swims 2/3 of a kilometer in 2/3 of an hour. What is Heidi's speed in kilometers per hour? Show your work or explain how you know.

If there are 60 seconds in an minute, 60 minutes in an hour, 24 hours in a day, and 7 days in a week, how many seconds are in a week? Hint: Use a calculator to solve this problem.

Which event prevented Descartes from publishing The World after he was done writing the book?

Pau is standing in front of a museum exhibition. Whe he turn his head 60 degrees to the left he can see a sttue by Bonatello. When he turns his head 60 degrees to the right, he an see a staty by Della Robbia.

3+11 (x+y) - 4 (x+y) ^{2}

at noon the teparature was 4'C. Over the next two hours the temparature dropped another 11 degrees. then every hour until 4:00 the temparature rose 2 degrees. What was the temparatureat 4:00

Find the missing length in the right triangle. 3 in. 12 in.

A manufacturer of computer printers purchases plastic ink cartridges from a vendor. When a large shipment is received, a random sample of 235 cartridges is selected, and each cartridge is inspected.

If the exterior angle of a regular polygon is 22.5, how many sides does it have?

Describe the similarities and differences in find the lateral areas of a prism and a pyramid that have congruent bases

Video game $35.99 and sales tax 6.75