if angle A and angle B are supplementary, and angle A and angle C are supplementary. What conclusion is valid

What is the value of x in the equation 2(x-4) = 4(2x + 1)?

Awater tank holds 18000 gallons. how long will it take for the water level to reach 6000 gallons if the water is used at anaverage rate of 450 gallons per day

Which of the following is the maximum value of the equation y=-x^2+2x+5 a. 5 b. 6 c. 2. d. 1