Replace ∗ with a monomial so that the expression can be rewritten as a square of a sum or a difference: ∗ +56a+49

Alonso walked with his friend andy one day, and wanted to compare their speeds. alonso walked 3 miles in one hour, and andy walked 2 miles in 2 hours. complete the table to graph the relationship for each person.

The? half-life of a radioactive substance is 20 years. if you start with some amount of this? substance, what fraction will remain in 120 ? years

Which two undefined geometric terms always describe figures with no beginning or end?