The school principal spent $2,000 to buy some new computer equipment. of this money $120 was used to buy some new keyboards. what percent of the money was spent on keyboard

Asimple random sample of size nequals14 is drawn from a population that is normally distributed. the sample mean is found to be x overbar equals 70 and the sample standard deviation is found to be sequals13. construct a 90% confidence interval about the population mean

Tim open up a new saving account with a $50 deposit and plant to deposit $20 per week into the same account.write an expression to represent the total amount in his savings account.

How do newtons third law of motion demonstrates on a rollar coster