Can someone tell me what to write of how i found the answer please ?!

Abank gives 6.5% interest per year. what is the growth factor b in this situation?

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?

The area of square garden is 300m squared. how long is the diagonal?