a rectangular hole 4 cm wide and x cm long is cut in a rectangular sheet of metal 9 cm wide and y cm long. the length of the hole is 8 cm less than the length of the metal sheet. after the hole is cut, the area of the remaining metal is 76 cm2 .
a.) find the length of the hole. answer in units of cm
b.) find the length of the metal sheet. answer in units of cm

Marco has $38.43 dollars in his checking account. his checking account is linked to his amazon music account so he can buy music. the songs he purchases cost $1.29. part 1: write an expression to describe the amount of money in his checking account in relationship to the number of songs he purchases. part 2: describe what the variable represents in this situation.

The distribution of the amount of money spent by students for textbooks in a semester is approximately normal in shape with a mean of $235 and a standard deviation of $20. according to the standard deviation rule, how much did almost all (99.7%) of the students spend on textbooks in a semester?

Aschool allots ? 1500 to spend on a trip to the theatre. theatre tickets have a regular cost of ? 55 each and are on offer for 1 5 off. a train ticket for the day will cost ? 12 each. if 2 teachers and the maximum number of students attend, how much money will the school have left over?