Daniella is interviewing for a job. she wants her take-home pay to be at least $51,000. what is the least salary she can earn if she pays 15% income tax?

Set this up as an equation, and this should give you your answer. Since we have to figure out her salary, let's call her salary "x" for now. We know that 15% will be taken out of her yearly salary, so that amount will be 15% of x, or 0.15 x. We know that she wants her pay to be 51,000. 

So knowing all this...your equation will be x - 0.15x = 51,000. 
Go ahead and solve for x. That should give you your answer. Good luck!