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25% = 0.25 or also one fourth of the total. Therefore if you divide 400 by 4, this equals 100. One fourth of 400 is 100. 

Electricity can be defined as a flow or motion of electric charge. If a substance can allow such flow it is said to conduct electricity. Sodium chloride is made of positively charged sodium ions and negat...

1. Structural isomers are compounds which have the the same molecular formula but the atoms are arranged in a different order. This can be due to a change in the carbon skeleton, the type of functi...

a) Differentiating gives d²y/dx²=-4x^-3-1/4

b) Let dy/dx=0 and rearrange to find x=2

c) Inserting x=2 into d²y/dx²=-4x^-3-1/4 ...

First, I would explain that what the student is referring to is known as a comparative. Then, I would explain what a comparative is (an adjective or adverb used in a comparison betwee...