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In 1870 the average ground temperature in Paris was 11.8°C. Since then it has risen at a nearly constant rate, reaching 13.5°C in 1969. (a) Express the temperature T (in °C) in terms of time t (in years), where t = 0 corresponds to the year 1870 and 0 ≤ t...

Find all solutions of the equation. x^4 + 3x^3 − 13x^2 − 9x + 30 = 0

List all possible rational zeros of the polynomial and then show that the equation has no rational root. x^5 − 8x^3 + 6x^2 + x − 2 = 0

A certain department store requires its credit-card customers to pay interest on unpaid bills at the rate of 18% per year compounded monthly. If a customer buys a television set for $500 on credit and makes no payments for one year, how much is owed at th...

When the volume control on a stereo system is increased, the voltage across a loudspeaker changes from V1 to V2, and the decibel increase in gain is given by db = 20 log [V2/V1] Find the decibel increase if the voltage changes from 3 volts to 4.5 volts.