A bag of marbles contains 5 red, 3 blue, 2 green, and 2 yellow marbles.
What is the probability that you choose a red marble and then a green marble assuming you replace the first marble?

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.

The base of a triangle exceeds the height by 7 centimeters. if the area is 400 square centimeters, find the length of the base and the height of the triangle.

In the equation sqrt(n+5)-sqrt(11-10)=1. what is the value of n