The cost in pence of producing a circular metal disc is proportional to the square of the radius in cm, of the disc when the radius is 3cm the cost is 2.25P find the cost of producing a disc of radius of 8cm

I've never been good at math he told he loves but he keeps cheating on me, so it ain't adding up sis

12. the amount of money in a bank account decreased by 21.5% over the last year. if the amount of money at the beginning of the year is represented by ‘n', write 3 equivalent expressions to represent the amount of money in the bank account after the decrease?

Thompson and thompson is a steel bolts manufacturing company. their current steel bolts have a mean diameter of 127 millimeters, and a variance of 36. if a random sample of 35 steel bolts is selected, what is the probability that the sample mean would differ from the population mean by greater than 0.5 millimeters? round your answer to four decimal places.