Find out the area and perimeter of circle of radius 7cm

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 value is a discontinuity of x squared plus 8 x plus 4, all over x squared minus x minus 6?

Calculate the annual effective interest rate of a 12 % nominal annual interest rate compound monthly