Solve the problem. Round results to an appropriate number of significant digits.A plane is found by radar to be flying 5.7 km above the ground. The angle of elevation from the radar to the plane is 84.0°. Ten seconds later, the plane is directly over the station. Find the speed of the plane, assuming that it is flying level.
A. 230 km/hr
B. 240 km/hr
C. 210 km/hr
D. 220 km/hr
Answer: D
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Solve the problem.A ship is moving around an island on a route described by 
If 
find the magnitude and direction of the ship's velocity where 
A. 19.6 km/h, 84° B. 17.9 km/h, 6° C. 19.6 km/h, 6° D. 17.9 km/h, 84°
In order to determine the effectiveness of a new vaccine that is alleged to cure "math anxiety," a study was conducted. One thousand volunteer college students enrolled in math courses across the U.S. were chosen. The 1000 students were broken up into two groups. Those enrolled in calculus courses were given the real vaccine. The students in developmental (remedial) math courses were given a fake vaccine consisting of sugared water. None of the students knew whether they were being given the real or the fake vaccine, but the researcher conducting the study knew. At the end of the semester the students were given a test that measured their level of math anxiety. The students in the treatment group showed significantly lower levels of math anxiety than those in the control group. On the
basis of this experiment the vaccine was advertised as being highly effective in fighting math anxiety.This study can best be described as a A. survey using stratified sampling. B. randomized controlled experiment. C. survey using quota sampling. D. controlled placebo experiment. E. census.
Find the simple interest. Round your answer to the nearest cent.Principal = $1150Rate = 3%Time in years = 1
A. $19.71 B. $6.04 C. $60.38 D. $670.83
Write a formula for the general term, or nth term, for the given sequence.
, 
, 
, 
, . . .
A. an = 
B. an = 
C. an = 
D. an = 