Any body still at school any body want to talk im bored

Thales was an ancient philosopher familiar with similar triangles. one story about him says that he found the height of a pyramid by measuring its shadow and his own shadow at the same time. if the person is 5-ft tall, what is the height of the pyramid in the drawing?

Find the missing dimension extra points

Prove that 16^4-2^13-4^5 is divisible by 11.