How many 9s are in 80?

What is the area of a sphere when the radius is 7? What does counter clockwise means in math term? What is a concave pentagon? Is angle abc similar to DEF? What is radius if the circumference of the top of a sewer cover is 10.99? Give the parts of the four fundamental operation? Change 3 5-9 into an improper fraction? How do you write 33 thousandths? What is 100 more than 80 hundreds? What has the same variable and exponent in math? What is part of anthonyms? What is the square root of 3.14 ten times? How many days is equal to 7 months? What is negative 0.5 - 3.5? What is 4 fives of 25? What is 14 divided by 16? How old would you be if your born in 2000? Did Albert Einstein attend college? What times what equals 884? How do you pronounce welsh numbers?