Solve 2x2 − 4x − 5 = 0 by completing the square.

What is the square root of 45? (step by step working plz)

The magnitude, m, of an earthquake is defined to be m=log l/s, where i is the intensity of the earthquake (measured by the amplitude of the seismograph wave) and s is the intensity of a “standard” earthquake, which is barely detectable. what is the magnitude of an earthquake that is 1,000 times more intense than a standard earthquake? use a calculator. round your answer to the nearest tenth.

15 and 14.7 are 1 apart, so 15 – 14.7 must be 1.