Height of a projectile if a rocket is fired vertically into the air with a speed of 240 feet per second, its height at timet seconds is given by h(t) = -16+ 240t. at what time(s) will the rocket be the following number of feet above the ground? a. 704 feetb. 896 feetc. why do parts a and b each have two answers? d. how long will the rocket be in the air? (hint: how high is it when it hits the ground? )e. when the equation for part d is solved, one of the answers is t = 0 second. what does this represent?

Atechnician compares repair costs for two types of microwave ovens (type i and type ii). he believes that the repair cost for type i ovens is greater than the repair cost for type ii ovens. a sample of 6767 type i ovens has a mean repair cost of $79.79$⁢79.79. the population standard deviation for the repair of type i ovens is known to be $19.18$⁢19.18. a sample of 5555 type ii ovens has a mean repair cost of $75.24$⁢75.24. the population standard deviation for the repair of type ii ovens is known to be $21.40$⁢21.40. conduct a hypothesis test of the technician's claim at the 0.050.05 level of significance. let μ1μ1 be the true mean repair cost for type i ovens and μ2μ2 be the true mean repair cost for type ii ovens. step 2 of 4 : compute the value of the test statistic. round your answer to two decimal places.