Which pair of ratios is proportional?

a.
6/21 and 2/42

b.
25/100 and 50/150

c.
18/24 and 6/12

d.
7/14 and 20/40

Which values for a and b will create infinitely many solutions for this system of equations? ax-y=8 2x+y=b

The ksp expression for the system pbcl2(s) pb+2(aq) + 2 cl-(aq) is: [pbc12][pb+2][2cl-] [pb+2][cl-]2 [pb+2][2cl-]2 [pbcl2][pb+2][cl-]2 [pb+2][2cl-]2[pbcl2]

Tom wants to order tickets online so that he and three of his friends can go to a water park the cost of the tickets is 16.00 per person there is also a 2.50 one-time service fee for ordering tickets online write an expression in term of n that represents the cost for n ordering tickets online