Let D(x)=3x^6-2. Write the equation of any functions h and k, so that D(x)=h(k(x))

What is the volume of the sphere shown below with a radius of 3?

What is the absolute value of the complex number -4-sqrt2i

Serena is making an experiment. for that, she needs 20 grams of a 52% solution of salt. she has two large bottles of salt water: one with 40% and the other with 70% of salt in them. how much of each must she use to make the solution she needs? i am in need of