The diameter of a circle is 13 cm what is the radius of the circle?

Find the domain of the following expression: 1/(√x)-2

Gabrielle's age is two times mikhail's age. the sum of their ages is 84. what is mikhail's age?

Cherie works in retail and her weekly salary includes commission for the amount she sells. the equation s=400+0.15c models the relation between her weekly salary, s, in dollars and the amount of her sales, c, in dollars. interpret the slope of the equation.