What is the frequency of the sine wave determined by y = sin(300pi * x) where x is time in seconds ?

Pls , the question is in the picture!

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?

Identify the number as a rational or irrational.explain. 127