Which ordered pair is the solution to the system of equations?
2x-5y= -5
x+2y= 11
a) (3,4)
b) (5,3)
c) (7,2)
d) (15,7)

Mary used 1/7 of a spool of ribbon to complete 4 projects. she used the same amount of ribbon on each project. how much ribbon did she use on each project?

Can someone me and plz do the problem

Suppose that sahil knows that 45 people with ages of 18 to 29 voted. without using a calculator, he quickly says then 135 people with ages of 30to 49 voted. is he correct? how might sohil have come up with his answer so quickly?