Express 25x²-40xy+16y² as perfect square​

Rockwell hardness of pins of a certain type is known to have a mean value of 50 and a standard deviation of 1.1. (round your answers to four decimal places.) (a) if the distribution is normal, what is the probability that the sample mean hardness for a random sample of 8 pins is at least 51?

In what organelle does photosynthesis take place?

Will give brainliest immeadeately true or false: the origin woud be included in the solution set for the inequality: y< 2x-5