What is the axis of symmetry of the function f(x) = –(x + 9)(x – 21)?

the axis of symmetry is x =

Determine the difference: 3.2 × 1010 – 1.1 × 1010. write your answer in scientific notation.

52 cm radius = diameter = area = circumference = circumfer

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.