What is the value of x^2 + 8x + 12 when x = -1

Achemist has 200 ml of a 10% sucrose solution. she adds x ml of a 40% sucrose solution. the percent concentration, y, of the final mixture is given by the rational function: the chemist needs the concentration of the final mixture to be 30%. how many milliliters of the 40% solution should she add to the 10% solution to get this concentration?

The step function g(x) is defined as shown.what is the range of g(x)? ***answer choices in picture.

If 1/√5+1/√5+1=p+q√r , find the values of p, q and r