Modeling with Exponential and Logarithmic Equations Answers

Which equation can you use to solve this problem?

The loudness of a compactor is 94 dB. Its sound intensity is about ✔ 0.00250.00430.0081.

The sound intensity of the jack hammer is about 2.051.85✔ 1.6 times the sound intensity of the compactor.

The loudness of a pile driver is 112 dB. About how many times the sound intensity of the jackhammer is the sound intensity of a pile driver? Round to the nearest ten.

After 100 years, about 60100✔ 115 grams of the sample will remain.

The equation for the pH of a substance is pH = –log[H+], where H+ is the concentration of hydrogen ions. What is the approximate pH of a solution if the concentration of hydrogen ions is 5.0 × 10–4 moles per liter?

The general equation for depreciation is given by y = A(1 – r)t, where y = current value, A = original cost, r = rate of depreciation, and t = time, in years. The original value of a car is $24,000. It depreciates 15% annually. What is its value in 4 years? $

After 10 years, a $2,000-dollar investment compounded annually has grown to $3600. What is the interest rate to the nearest whole-number percent? %

Question text not available

The loudness of a jack hammer is 96 dB. Its sound intensity is about 0.0096✔ 0.0040.0021.

Examine the data below for a stalk of corn. Use logarithmic regression to find an equation of the form y = a + b ln(x) to model the data.

Using the graphing calculator, estimate to the nearest day how long it will take the corn to reach 6 feet tall: 45✔ 516372

How would you explain the relationship between the real zero(s) of the function and x-intercept(s) of the graph?

Which equation has real zeros corresponding to the x-intercepts of the graph?

b =