OMGG can i get someone that will actualy help me with my missing math work

What is the point of inflection for the function f(x)=2cos4x on the interval (0, pi/2)

Let x = a + bi and y = c + di and z = f + gi. which statements are true?

Type the correct answer in the box. use numerals instead of words. if necessary, use / for the fraction bar. a city water tank holds 20 gallons of water. a technician empties 25% of the tank. how many more gallons of water must be removed from thetank so that it has 5 of the water that it started with: the technician must removemore gallons of water for the tank to have 5 of the water that it started with.