A good quaterback can throw a football with great accuracy, judging time and distance to his receivers. The quadratic function used to show the height of the ball tossed with respect to time t is
h(t) = -16t2+v0 . t + h0 where v0 is the initial velocity at which the ball is thrown and h0 is the initial
height of the ball. Let's say the quaterback is 6 feet tall and he throws the ball at an initial velocity of 42 feet
per second. Which of the following represents the best estimate of the height of the football 2 seconds after
it is thrown by the quaterback?

Acell phone company offers two plans to its subscribers. at the time new subscribers sign up, they are asked to provide some demographic information. the mean yearly income for a sample of 40 subscribers to plan a is $45,000 with a standard deviation of $9,200. for a sample of 25 subscribers to plan b, the mean income is $64,300 with a standard deviation of $7,100. at the 0.025 significance level, is it reasonable to conclude the mean income of those selecting plan b is larger? assume unequal population standard deviations. hint: for the calculations, assume the plan a as the first sample. what is the decision rule? (negative amount should be indicated by a minus sign. round your answer to 3 decimal places.) compute the value of the test statistic. (negative amount should be indicated by a minus sign. round your answer to 2 decimal places.) what is your decision regarding h0 ? reject h0 fail to reject h0 compute the p-value. less than 0.01 between 0.01 and 0.025 between 0.025 and 0.05 between 0.05 and 0.10 greater than 0.10