Solve the problem.A plane makes a 240-mile trip against a head wind in 1 hour and 30 minutes and returns, with a tail wind of the same speed, in 1 hour. What is the speed of the wind?
A. 200 mph
B. 80 mph
C. 160 mph
D. 40 mph
Answer: D
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Use a tree diagram showing all possible results when four fair coins are tossed. Then list the ways of getting the indicated result.tails on the first coin
A. thhh, thht, thth, thtt, tthh, ttht, ttth, tttt B. thhh, thht, thth, thtt, tthh, ttth, tttt C. thhh, tthh, ttth, tttt D. thhh, thht, thtt, tthh, ttht, tttt
Solve the problem.In Smithville, there were 242 teachers in 1990 and 319 teachers in 2000. Find the percent of increase in the number of teachers in Smithville during this time period. Round to the nearest tenth of a percent.
A. 31.8% B. 35% C. 38.2% D. 24.1%
Solve the problem. If necessary, round your result to the nearest tenth unless instructed differently. The precise value of your approximation may depend on the conversion path that you choose.A label on a box shows that the box weighs 130 kg. How many pounds is that?
A. 330.2 lb B. 137.8 lb C. 286 lb D. 59 lb
Find the center, foci, and vertices of the ellipse.
+ 
= 1
A. center at (2, -2)
foci at (- 
, -2), (
, -2)
vertices at (4, -2), (-4, -2)
B. center at (2, -2)
foci at (2 + 
, -2), (2 - 
, -2)
vertices at (-2, -2), (6, -2)
C. center at (-2, 2)
foci at (-2 + 
, 2), (-2 - 
, 2)
vertices at (-2, -2), (6, -2)
D. center at (2, -2)
foci at (2 + 
, 2), (2 - 
, 2)
vertices at (4, -2), (-4, -2)