Pls answer fast. i will mark as brainliest answer

This is easy because the answer is 130 because if the 2 numbers were 320 and 420 then the difference between them would be 100, so if the lowest number was decrease by 10 then that would make 310, and if the highest number was increased by 20 then that would make 440, and then the difference would be 130.

130-answer

hope this helps

what level of math? also i don't need to be paid if i can you.

x= cost per bracelet

number of bracelets * x + shipping charge = total cost

so

9x+9=72