1 Given That y varies directly as x. If x=5 when y=45 find x when y=270

Multiplying an even number of negative numbers gives an answer that is choose from:

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?

Ineed to know the answer to this algebra question.