There are 20 at lunch . one -fifth of the students are in the hall . how many students are in the hall ?

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.

Which of the following is correct interpretation of the expression -4+13

Look at triangle wxy what is the length (in centimeters) of the side wy of the triangle?