Please answer 8-11 and please show steps. Algebra math.
For f(x) = 2/x - 4 + 3/x + 1. Algebraically find x when f(x) = 5. A rational expression A/B is zero when A = 0 and B notequalto 0. For what x-value will x^2 - 9/x^2 - x - 12 equal is zero? A person's weight, W, is directly proportional to their mass M. Someone that weighs 210 pounds on Earth has mass of 6.5625 pounds. If a person's mass is 4.375 pounds, what is their weight on Earth? The loudness of a stereo speaker, measured in decibles (dB), varies inversely as the square of your distance from the speaker. When you are 8 feet from the speaker, the loudness is 28dB. What is the loudness when you are 4 feet from a speaker? Gasoline in Vancouver, British Columbia today costs $1.31 (Candian dollars) per liter. Find the price of gasoline in terms US dollars per gallon. Note that 0.74 US dollar = 1 Canadian dollar, and 1 gallon = 3.78 liters. Show your work.
Show transcribed image text For f(x) = 2/x - 4 + 3/x + 1. Algebraically find x when f(x) = 5. A rational expression A/B is zero when A = 0 and B notequalto 0. For what x-value will x^2 - 9/x^2 - x - 12 equal is zero? A person's weight, W, is directly proportional to their mass M. Someone that weighs 210 pounds on Earth has mass of 6.5625 pounds. If a person's mass is 4.375 pounds, what is their weight on Earth? The loudness of a stereo speaker, measured in decibles (dB), varies inversely as the square of your distance from the speaker. When you are 8 feet from the speaker, the loudness is 28dB. What is the loudness when you are 4 feet from a speaker? Gasoline in Vancouver, British Columbia today costs $1.31 (Candian dollars) per liter. Find the price of gasoline in terms US dollars per gallon. Note that 0.74 US dollar = 1 Canadian dollar, and 1 gallon = 3.78 liters. Show your work.