what's the selling price if $42.50 was the original price and the markup is 6% with a discount of 5%​

If f(x)=2x-6 and g(x)=3x+9, find (f-g)(x)

Find the solution of this system of equation -7x+y=-20 9x-3y=36

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?