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25. A salesperson earns a base salary of $1,820 per month and a commission of 6.8% on the amount of sales made. If the salesperson has a paycheck of $5 ,1 18 for one month, what was the amount of sales for the month? Show work. 26. Letf(x)=5x2+7 and g(x)=x3. (a) Find the composite function (f og)(x) and simplify. Show work. (b) Find (f og)(1). Show work. 27. Find the exact solutions and simplify as much as possible: 16x2 + 5 = 20x. Show work. 28. Given the function f (x) = 5 %x, nd a formula for the inverse function. Show work