How many edges are there in an octahedron, a polyhedron with eight congruent triangular faces?

The equation x2 – 1x – 90 = 0 has solutions {a, b}. what is a + b?

Liz is shipping a package to her friend. the maximum weight of a medium flat-rate box is 20 pounds, including the box which weighs 6 ounces. write and solve an inequality to describe the possible weight ,w, of the contents that liz will ship to her friend if she must use a medium flat-rate box.

Robert has 78 tomatoes and 56 cucumbers he wants to plant them in equal rows how many in each row