15. Use properties of logarithms to write the following expression as a single logarithm with a coefficient of one. 2log(x + 6) - log,(7y) 16. Company Y makes several types of sprockets. The fixed cost for one type of sprocket is $5000 per month. Materials and labor this same type of sprocket are $80. This type of sprocket sells for $100 each. Answer the following questions below. (a) Find the cost function. (b) Find the revenue function. (c) Find the profit function and simplify it. (d) Find how many types of that sprocket must be sold to break even