The explicit form of a(n)=1/2(n^2+n)
Converted into recursive form

Haley buys 9 pounds of apples for $3. how many pounds of apples can she buy for $1?

The distance between two points is 6.5cm and scale of map is 1: 1000 what's the distance between the two points

Layla answer 21 of the 25 questions on his history test correctly. what decimal represents the fraction of problem he answer incorrectly.