At Pizza Pi, 55% of the pizzas made last week had extra cheese. If 11 pizzas had extra cheese, how many pizzas in all were made last week?

Is every rectangle is a parallelogram? true false

According to modern science, earth is about 4.5 billion years old and written human history extends back about 10,000 years. suppose the entire history of earth is represented with a 10-meter-long timeline, with the birth of earth on one end and today at the other end.

What is the number 321,000,000 in scientific notation? also what is the number? ?