Prove that (i−a)−1=i+a+a2+a3+···+an if an+1= 0

60 2(x + 2) in the diagram, gef and hef are congruent. what is the value of x?

The vertices of a triangle are a(7.5), b(4,2), and c19. 2). what is

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?