A number with an exponent (b^e) consists of a base (b) raised to a power (e). The exponent indicates the number of times that the base is multiplied by itself. A base with an exponent of 1 equals the base (b¹ = b) and a base with an exponent of 0 equals 1 ( (b⁰ = 1).

You have 16 out of the total of 200 raffle tickets sold so you have a (\( \frac{16}{200} \)) x 100 = \( \frac{16 \times 100}{200} \) = \( \frac{1600}{200} \) = 8% chance to win the raffle.

Use PEMDAS (Parentheses, Exponents, Multipy/Divide, Add/Subtract):

4 + (3 + 4) ÷ 5 x 3 - 4²
P: 4 + (7) ÷ 5 x 3 - 4²
E: 4 + 7 ÷ 5 x 3 - 16
MD: 4 + \( \frac{7}{5} \) x 3 - 16
MD: 4 + \( \frac{21}{5} \) - 16
AS: \( \frac{20}{5} \) + \( \frac{21}{5} \) - 16
AS: \( \frac{41}{5} \) - 16
AS: \( \frac{41 - 80}{5} \)
\( \frac{-39}{5} \)
-7\(\frac{4}{5}\)

The first few multiples of 8 are [8, 16, 24, 32, 40, 48, 56, 64, 72, 80] and the first few multiples of 10 are [10, 20, 30, 40, 50, 60, 70, 80, 90]. The first few multiples they share are [40, 80] making 40 the smallest multiple 8 and 10 have in common.

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

\( \frac{14 + 6 + 14 + 6}{4} \) = \( \frac{40}{4} \) = 10