Do tessellations have to be polygons?

Which of the following is not a condition for a tessellation?

The shape or shapes must be repeated.

The shapes must not overlap.

There can be no gaps.

The shapes must be polygons.

Mike put 400 baseballs into 10 trash bins. He put the same number of baseballs in each bin. He took 5 trash bins of baseballs to the baseball field. How many baseballs did Mike take?

Perform the following calculations without rewriting the numbers in decimal form (6 * 10^11) (2.5 * 10^-5)

A 91 square foot bathroom has a length of 13 feet. what is the width of the bathroom

10x - 29 - 7x=-53 what is x?

What are the values of x and y when (3-2i) - (x+yi) = (2-3) ?

A newspaper reporter wants to know how popular the hobby of bird watching is in the city. He asked people at the local bird refuge if they watched birds as a hobby. Which of the following best explains whether the reporters data is valid or not?

I am very confused on how to figure out if y = 3/4x is proportional?

Alison wants to buy a mountain bike for $339.12. If she saves $28.26 each month, in how many months will she be able to buy the bike?

At 12 o'clock the temperature was 7°C. The temperature decreased by - 20°C. What is the new temperature?

Ashleys rentals charges $27.50 per hour to rent a surfboard and a wetsuit. Darlas surf shop charges $23.25 per hour to rent a surfboard plus $17 extra for a wetsuit.