it costs $5.25 for a bottle of 150 vitamins. if the cost varies directly with the number vitamins in the bottle, what should a bottle of 250 vitamins cost?

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.

What is the missing step in this proof ?

How to simply and write the answer n a whole number