Q:

8 PTS!!! PLEASE IT'S TIMED, I PROMISE BRAINLIST... IT'S SIMPLE PLEASEEEE11. 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

Accepted Solution

A:
11 is B12 C13 C14 B (4^-2= 1/(4^2))These ones aren't hard. Add the exponents if it's multiplying, subtract if it's dividing.The rest, multiply the numbers and add the exponents, then adjust for added digits.Example:15 (2.3*10^1)(7*10^6)2.3*7=16.11+6=716.1*10^7but then adjust for sci not: 1.61*10^8Move the decimal left one, add one to 10's exponent.