Please help Find the values for c so that t^2 + ct + 81 = 0 has one real root.
12 + ct + 81 = 0

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.

Based on the figures as marked, /\rqs = —

Maria walks a round trip of 0.75 mile to school every day.how many miles will she walk in 4.5 days