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# Tutor profile: Kevin D.

Inactive
Kevin D.
Tutor for Seven Years, Both Offline and Online
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## Questions

### Subject:SAT

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Question:

What is the average (arithmetic mean) of all the multiples of ten from 10 to 190 inclusive?

Inactive
Kevin D.

To solve this, we add up all of the terms in between and including 10 and 190 to find the total value of all of the multiples, then we divide this value by 19, or the total number of terms, to find the average.

### Subject:Calculus

TutorMe
Question:

What is the point behind u-substitution?

Inactive
Kevin D.

When faced with a difficult integral question that has multiple expressions, one of the most basic ways of solving them is by using u-substitution. By setting 'u' equal to the expression with the higher exponent and differentiating this term, one can solve the integral in terms of 'u; and 'du' in a much simpler question.

### Subject:Electrical Engineering

TutorMe
Question:

What is the significance behind a XOR Gate?

Inactive
Kevin D.

A XOR Gate is one of the many digital logic gates that provides a True Input when the number of True inputs is odd. This is mainly implemented when building a binary addition calculator.

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