The letters a, b, c, d, e, f, g, h, i, and j are written on slips of paper and placed in a hat. two letters are then drawn from the hat. what is the probability that the letters chosen would be only b, c, d, or f?

Idont understand math at all! : o( use this scenario to answer the remaining questions: brenton purchased a new bedroom set for $4,500.00. he lives in arizona and pays a 8.75% sales tax. if he made a 50% down payment and financed the rest, what amount did he finance? what is the total sales tax brenton will pay? enter your answer in currency format, round to the nearest cent. what was brenton's total amount financed? enter your answer in currency format, round to the nearest cent.

Icould really use some with this question.

[10 points, algebra 2]according to my answer key the restrictions are -1 and 4. but why not positive 1?