What three compounds make bases?

Bases are ionic compounds consisting of hydroxide ions and a cation. The naming rules for acids are based on the suffix of the anion.Aug 2, 2012

Step-by-step explanation:

it's equivalent, so we can say that its equal.

let's call the denominator x and the numerador is 18 less then denominator, x - 18.

multiply

2.x = 5.(x - 18)

2x = 5x - 90

90 = 5x - 2x

90 = 3x

x = 90/3

x = 30

so:

the answer is d

hope this