Jamal started writing thank-you notes at 5:25. It took him 20 minutes to write them.
He also spent some time writing addresses 6:00. How
long did it take Jamal to write the addresses? Show your work.

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.

How many solutions does the nonlinear system of equations graphed below have?

Afrequency table of grades has five classes (a, b, c, d, f) with frequencies of 3, 13, 14, 5, and 3 respectively. using percentages, what are the relative frequencies of the five classes?