Which of the following relations is a function? a.{ (-2, 4), (-1, 3), (5, 2), (1, 4) } b.{ (1, 7), (1, 8), (2, 7), (3, 8) } c.{ (2, 4), (4, 6), (4, 8), (6, 4) } d.{ (5, 7), (6, 3), (8, 6), (5, 4) }

Find the value of the cosine for angle a

Cumulative examcumulative exam active13time remaining02: 44: 18the graph represents the data cost for monthly internetservice for a cell phone.which function, c(x), represents the monthly cost in dollarsin terms of x, the number of gigabytes used in a month? cell phone internet service(15,5x + 10150,0sx522 < x < 664x115, osx< 25x + 20, 2< x< 650, 65815%,monthly cost (s)20x + 5| 50x,0 < x < 22 < x < 664x( 15x, osx< 2c(x) = 5x + 10, 2< x< 6150x, 65 x5+1234 5 6 7 8 9 10 11 12gigabytes used

The value √10 and √15 are plotted on the number line