How to find all real and imaginary zeros of f(x)=x^4+5x^2-5x^3-6+5x

How many kilograms of a 5% salt solution and how many kilograms of a 15% salt solution must be mixed together to make 45kg of an 8% salt solution?

You can ride your bike around your block 6 times and the whole neighborhood 5 times in 16 minutes. you can ride your bike around your block 3 times and the whole neighborhood 10 times in 23 minutes. how long does it take you to ride around the neighborhood?

Use the zero product property to find the solutions to the equation (x+2)(x+3)=12