A prime number is an integer greater than 1 that has no factors other than 1 and itself. Examples of prime numbers include 2, 3, 5, 7, and 11.

The equation for this sequence is:

a_n = a_n-1 + 2(n - 1)

where n is the term's order in the sequence, a_n is the value of the term, and a_n-1 is the value of the term before a_n. This makes the next number:

a₆ = a₅ + 2(6 - 1)
a₆ = 21 + 2(5)
a₆ = 31

To subtract these fractions, first find the lowest common multiple of their denominators. The first few multiples of 8 are [8, 16, 24, 32, 40, 48, 56, 64, 72, 80] and the first few multiples of 16 are [16, 32, 48, 64, 80, 96]. The first few multiples they share are [16, 32, 48, 64, 80] making 16 the smallest multiple 8 and 16 share.

Next, convert the fractions so each denominator equals the lowest common multiple:

\( \frac{3 x 2}{8 x 2} \) - \( \frac{6 x 1}{16 x 1} \)

\( \frac{6}{16} \) - \( \frac{6}{16} \)

Now, because the fractions share a common denominator, you can subtract them:

\( \frac{6 - 6}{16} \) = \( \frac{0}{16} \) =

To multiply terms with exponents, the base of both exponents must be the same. In this case they are so multiply the coefficients and add the exponents:

5c² x 3c²
(5 x 3)c^{(2 + 2)}
15c⁴

To multiply fractions, multiply the numerators together and then multiply the denominators together:

\( \frac{2}{6} \) x \( \frac{1}{9} \) = \( \frac{2 x 1}{6 x 9} \) = \( \frac{2}{54} \) = \(\frac{1}{27}\)