Let x be the total minutes used Total cost = 40 + 0.45(x - 700)
------------------------------------------------------------------ Form the equation and solve x ------------------------------------------------------------------ 40 + 0.45(x - 700) = 48.10 40 + 0.45x - 315 = 48.10 0.45x - 275 = 48.10 0.45x = 48.10 + 275 0.45x = 323.10 x = 323.10 ÷ 0.45 x = 718
------------------------------------------------------------------ Answer: John had used 718 mins this month ------------------------------------------------------------------
Since there is 1 blue block and 3 yellow blocks that would equal to 4 blocks in total. So the question is asking how many green blocks would be needed to make it 1/2. So you would be needing 4 green blocks to make the probability of randomly selecting a green block from the bag to equal 1/2.
