52 is what percent of 260

What is this inequality notation? t is less then or equal to 2

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?

Look at this pattern ; 1,4,9, number 10000 belongs in this pattern . what’s the place of this number?