If z varies inversely as w, and z=40 when w=0.1, find z when w=20

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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).

What power can you write to represent the volume of the cube shown? write the power as an expression with a base and an exponent and then find the volume of the cube