If x-1/3=k and k=3 what is the value of x

How many real and imaginary solutions does the equation x^2-3x=-2x-7 have?

How much dextrose 70% must be mixed with dextrose 5% to prepare 1,000 ml of dextrose 20%?

The length of a shadow of the building is 36m. the length of the pole, which is perpendicular to the ground, is 1.9m. the length of the pole's shadow is 1.52m. what is the height of the building?