The polynomial equation y = -0.0545x2 + 5.047x + 11.78gives a good approximation of the

Chapter 5, Problem 100

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The polynomial equation y = -0.0545x2 + 5.047x + 11.78gives a good approximation of the age of a dog in human years y, where x represents age in dog years. Each time we evaluate this polynomial for a value of x, we get one and only one output value y. For example, if a dog is 4 in dog years, let to find that . (Verify this.) This means that the dog is about 31 yr old in human years. This illustrates the concept of a function, one of the most important topics in mathematics. Exercises 97100 further illustrate the function concept with polynomials. Work these exercises in order.If it costs $15 to rent a chain saw, plus $2 per day, the binomial gives thecost to rent the chain saw for x days. Evaluate this polynomial for . Use theresult to fill in the blanks: If the saw is rented for days, the cost is .