Factor x2 + 9 in the complex numbers.
a) (x + 3)(x - 3)
b) (x + 3)(x + 3)
c) (x + 3i)(x - 3i)
d) (x + 3i)(x + 3i)

Abcd is a square. what is the measure of angle bac

What unit of been sure would be appropriate for the volume of a sphere with a radius of 2 meters

Titus works at a hotel. part of his job is to keep the complimentary pitcher of water at least half full and always with ice. when he starts his shift, the water level shows 4 gallons, or 128 cups of water. as the shift progresses, he records the level of the water every 10 minutes. after 2 hours, he uses a regression calculator to compute an equation for the decrease in water. his equation is w –0.414t + 129.549, where t is the number of minutes and w is the level of water. according to the equation, after about how many minutes would the water level be less than or equal to 64 cups?