Shopkeeper purchased 90 dozens of the pens for 1 pen he cost Rs 25 and sold at Rs 27 each pens find his/her profit •\° , profit amount​.

State one method by which you can recognize a perfect square trinomial.

Monitors manufactured by tsi electronics have life spans that have a normal distribution with a standard deviation of 1800 hours and a mean life span of 20,000 hours. if a monitor is selected at random, find the probability that the life span of the monitor will be more than 17,659 hours. round your answer to four decimal places.

Adeposit of 5500 at 6% for 3 years equals