Find a ratio that compares the relative sizes of the
quantities.
13,000 pounds to 3 tons

There are 2,000 pounds in a ton so multiply that by 3 to get the number of tons for that side of the ratio. You get 6,000 pounds. So the set up would be

13,000 pounds to 6,000 pounds. Or simplify it down to 13 pounds to every 6 pounds.

b

step-by-step explanation:

a difference is the result of subtraction. while each of these expressions has subtraction in it, a difference will be the result when subtraction is the last operation applied in the order of operations for the expression. this means subtraction must be outside of the parenthesis. only b has this.

45

step-by-step explanation:

to find a percentage, add a decimal in front and multiply it by the other number.

.25 times 180= 45