Keisha, Deandre and Greg sent a total of 87 text messages during the week end. Greg sent 4 times as many messages as Keisha. Deandre sent 9 fewer messages than keisha. How many text messages did each send?

Name the quadrilaterals that have four equal sides.

The random variable x is the number of occurrences of an event over an interval of ten minutes. it can be assumed that the probability of an occurrence is the same in any two-time periods of an equal length. it is known that the mean number of occurrences in ten minutes is 5.3. the appropriate probability distribution for the random variable

Afactory buys 10% of its components from suppliers b and the rest from supplier c. it is known that 6% of the components it buys are faulty. of the components brought from suppliers a,9% are faulty and of the components bought from suppliers b, 3% are faulty. find the percentage of components bought from supplier c that are faulty.