What is a 4 digit number that can be divided by 5 and 9

Is the following relation a function? x y 1 4 −1 −2 3 10 5 16 yes no

Acircus act has 3 times as many elephants as acrobats. jorge noticed that all together there were 56 legs in the circus ring. how many elephants were in the show?

List x1, x2, x3, x4 where xi is the midpoint endpoint of the five equal intervals used to estimate the area under the curve of f(x) between x = 0 and x = 10.