Explain how the rule of three works to solve a percentage question

What is the volume of a cone with a height of 6 cm in the radius of 2 cm

Rewrite the following quadratic functions in intercept or factored form. show your work. y = 5x^2 + 10x

Ihave a triangle with a 60 degree angle. lets use d for that angle. what are the values of e and f if d is 60 degrees? and what do you notice about the values of e and f?