What is the exact value for the expression the square root of 52. − the square root of 13. + the square root of 117.? simplify if possible.
a: 4 the square root of 13.
b: the square root of 13.
c: 2 the square root of 39.
d: 8 the square root of 39.

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.