You can write "twelve less than a number" as n - 12, but not as 12 - n. explain why.

Oscar and julie ashton are celebrating their 15th anniversary by having a reception hall. they have budgeted $4,500 for their reception. if the reception hall charges a $90 cleanup fee plus & 36 per person, find the greatest number of people that they may invite and still stay within their budget.

The sides of a parallelogram are 24cm and 16cm. the distance between the 24cm sides is 8 cm. find the distance between the 16cm sides

The difference of two numbers is 40. find the numbers if 0.3 parts of one number is equal to 37.5% of the other one.