Write an expression equivalent to 3+ 5y-4-5

plz help oml​

In the rectangle below ac=30 units what is de

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.

Ijust need to see how to do this. so you don’t have to answer all of them just a step by step explanation of one.