he selling price of an item is $650. It is marked down by 10%, but this sale price is still marked up from the cost of $450. Find the markup from cost to sale price.

Compare these two waves: the blue and orange waves have the same pitch, but the blue wave is louder. the blue and orange waves have the same volume, but the blue wave has a higher pitch. the orange wave has a higher pitch, but the blue wave is louder. the blue wave has a higher pitch, but the orange wave is louder.

Find the center and the radius of the circle with the equation: x^2-2x+y^2+4y+1=0?

If you could answer these your a life saver