[algebra]can someone check my work, if something is wrong state steps?

question: solve d = 16t^2

Multiplying an even number of negative numbers gives an answer that is choose from:

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).

[15 points, algebra 2]simplify the complex fraction and find the restrictions.