8! it's timed, i promise it's simple 11. which of the following expressions is true? a. 4^3• 4^4 = 412b. 5^2 • 5^3 > 5^5c. 3^2 • 35 < 3^8d. 5^2 • 54 = 5812. which of the following expressions is true? a.8^3 • 8^2 < 8^4b. 4^4 • 4^4 = 4^16c. 2^2 • 2^6 < 2^8d. 3^3 • 3^3 > 3^5write the value of the expression.13. 3^4/3^4a. 3b. 0c. 1d. 414. 4^7/4^9a. –16b. 1/16c. 1/8d. 8multiply. write the result in scientific notation.15. (2.3 • 10^1)(7 • 10^6)a. 1.61 • 10^7b. 1.61 • 10^8c. 9.3 • 10^6d. 9.3 • 10^716. (1.7 ∙ 10–4)(5 ∙ 10–5)a. 8.5 ∙ 10^–9b. 8.5 ∙ 10^20c. 6.7 ∙ 10^–9d. 6.7 ∙ 10^20simplify the expression.17. 7t4 ∙ 7t4a. 49t^8b. 14t^4c. 49t^16d14t^8simplify the expression.18. –x(7x – 8)a. 6x^2 – 9xb. –7x – 8xc. –7x^2 + 8xd. 7x + 8xsimplify the expression.19. 4k2(–3k2 – 4k + 5)a. –12k^4 – 16k^3 + 20k^2b. 12k^4 – 16k^3 + 9k^2c. –12k^3 + 20kd. k4 + 9k^2simplify the expression.20. (2k + 1) (k – 4) a. 2k^2 – 7k + 4b. 2k^2 –3k + 4c. 2k^2 + 9k + 4d. 2k^2– 7k – 4