To find the average of these 4 numbers add them together then divide by 4:

\( \frac{7 + 5 + 7 + 5}{4} \) = \( \frac{24}{4} \) = 6

To add or subtract terms with exponents, both the base and the exponent must be the same. In this case they are so add the coefficients and retain the base and exponent:

9b³ + 2b³
(9 + 2)b³
11b³

Average speed in miles per hour is the number of miles traveled divided by the number of hours:

Solving for distance:

distance = \( \text{speed} \times \text{time} \)
distance = \( 65mph \times 1h \)
65 miles

To add these fractions, first find the lowest common multiple of their denominators. The first few multiples of 6 are [6, 12, 18, 24, 30, 36, 42, 48, 54, 60] and the first few multiples of 14 are [14, 28, 42, 56, 70, 84, 98]. The first few multiples they share are [42, 84] making 42 the smallest multiple 6 and 14 share.

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

\( \frac{2 x 7}{6 x 7} \) + \( \frac{7 x 3}{14 x 3} \)

\( \frac{14}{42} \) + \( \frac{21}{42} \)

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

\( \frac{14 + 21}{42} \) = \( \frac{35}{42} \) = \(\frac{5}{6}\)

To raise a term with an exponent to another exponent, retain the base and multiply the exponents: