A plane can fly 480 mph in still air. If it can fly 510 miles downwind in the same amount of time it can fly 450 miles upwind, find the velocity of the wind.
?
A. 60 mph
B. 30 mph
C. 40 mph
D. 45 mph
E. 53 mph
Answer: B
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Write a differential formula that estimates the given change in volume or surface area.The change in the volume V = ?r2h of a right circular cylinder when the height changes from h0 to h0 + dh and the radius does not change
A. dV = ?r2h0 dh B. dV = ?r2 dh C. dV = 2?rh0 dh D. dV = ?r02 dr
Simplify. Express in terms of i.
A. -7i
B. ±7
C. 7i
D. i
Write an equation for the ellipse.Foci (±6
, 0) and x-intercepts (±9, 0)
A. 
+ 
= 1
B. 
+ 
= 1
C. 
+ 
= 1
D. 
+ 
= 1
Solve the problem.During an intramural basketball game, Team A scored 18 fewer points than Team B. Together, both teams scored a total of 146 points. How many points did Team A score during the game?
A. 64 points B. 73 points C. 82 points D. 65 points