Solve the problem.If a rock falls from a height of 30 meters on Earth, the height H (in meters) after x seconds is approximately H(x) = 30 - 4.9x2.When does the rock strike the ground? Round to the nearest hundredth, if necessary.
A. 1.12 sec
B. 6.12 sec
C. 2.47 sec
D. 1.25 sec
Answer: C
Mathematics
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Solve the problem.A private airplane leaves an airport and flies due east at 175 mph. Two hours later, a jet leaves the same airport and flies due east at 315 mph. When will the jet overtake the plane?
A. 1
hr
B. 2
hr
C. 4
hr
D. 
hr
Mathematics
Use the rules for exponents to rewrite the expression and then evaluate the new expression. (72)-1
A. 
B. - 
C. -14
D. -49
Mathematics
Simplify the complex fraction.
A. 
B. 2
C. 
D. 
Mathematics
If a planar drawing of a graph has 12 edges and 8 vertices, how many faces does the graph have?
a. 20 b. 6 c. 32 d. 5
Mathematics