Simplify: 6a² - 2c + 2a² - 2c² and which set of numbers best describe the value?

Mathematics
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Simplify: 6a² - 2c + 2a² - 2c²

a.  8a²  - 2c²  - 2c

b.  4a²  c² 

c.  8a²  - 4c

d.  4a²  - 2c

The average time it takes a swimmer to complete a lap is represented by the variable t. Which set of numbers best describes the value of the variable?

a.  integers

b.  irrational numbers

c.  rational numbers

d.  whole numbers

May 7th, 2015

Answers:  a.   8a^ -2c^2 -2c

                d. whole numbers

Explanation: in the algebraic expression given, group  the like terms which are 6a^2 and 2a^2 and add them.

                     Whole numbers are positive and laps can only be positive. Laps  cannot be negative.

May 7th, 2015

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