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What is the best approximation for the area of a circle with a radius of 4 m ? use 3.14 to approximate pi

Write the equation in logarithmic form m^x=n

Ben frank is an electrician who installs lighting fixtures. he charges (in dollars) his clients 15h+40f15h+40f where hh is the number of hours worked and ff is the number of fixtures installed. how much does ben frank charge when he works 77 hours and installs 99 fixtures?