43,785 to the nearest ten thousand

Each month, a shopkeeper spends 5x + 14 dollars on rent and electricity. if he spends 3x−5 dollars on rent, how much does he spend on electricity? for which value(s) of x is the amount the shopkeeper spends on electricity less than $100? explain how you found the value(s).

Determine the difference: 3.2 × 1010 – 1.1 × 1010. write your answer in scientific notation.

I'm confused on this could anyone me and show me what i need to do to solve it.