# Tutor profile: Devon K.

## Questions

### Subject: Pre-Algebra

Find the product: 1/2+1/4+1/5

The first thing that must happen when adding fractions is to find the common denominator In this problem 2, 4, and 5 have a common denominator of 20 2x10=20 4x5=20 5*4=20 It is important to remember whatever you do to the top number must happen to the bottom number so to get a common denominator of 20 for 1/2 multiply 2 by 10 and 1 by 10 which gives you a fraction of 10/20 same thing for 1/4 and 1/5 1/4x5/5= 5/20 1/5x4/4= 4/20 Now that we have common denominators we can add the fractions and it should look like this 10/20+5/20+4/20 another way simplify this is by ignoring the bottom part of the fraction and simply adding the top number 10+5+4 ------------ 20 your answer will be 19/20 since this fraction cannot be reduced this will be the final answer of the problem we can recognize that 19 is a prime number which automatically means the fraction cannot be reduced

### Subject: Chemistry

Explain a basic Rankine Cycle

A simple explanation of the rankine cycle would be to think of a basic steam power plant. You use a boiler which uses fuel to create heat through combustion to heat water. The water will eventually reach the boiling point and turn to steam. The steam is then used to convert the steam into mechanical energy by rotating that turbine, which will be coupled to a generator that creates electricity to provide power. Once that steam goes through the turbine it goes into a condenser where it is cooled and condensed back into water and the returns back to the starting point where it is then converted back to steam.

### Subject: Physics

Explain what the basic concept of mass defect.

Mass defect is the concept that the total mass of an atomic nucleus is less the the combined sum of of the protons and neutrons. The reason this holds true is because in an Isotope the atomic number will remain the same, which is why the chemical properties of Isotope are the same as the original element. However, the atomic mass will change.

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