Solve the problem.A toy rocket is shot vertically upward from the ground. Its distance in feet from the ground in t seconds is given by 
. At what time(s) will the ball be 
from the ground?
A. 167.8 and 178.2 sec
B. 0.8 and 10.0 sec
C. 10.8 sec
D. 5.4 sec
Answer: B
Mathematics
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List all numbers from the set that are of the type indicated.
Integers
A. 
, 
, 
, 
B. 
, 
, 
C. 
, 
, 
, 
D. 
, 
, 
Mathematics
Decide whether or not the set is closed under multiplication.{1, 2, 3, 4, . . .}
A. Closed B. Not closed
Mathematics
Simplify the expression. Assume that all variables are positive when they appear.
A. 
B. -13
C. -13
D. 
Mathematics
Add. Simplify the result whenever possible.
+ 
A. 
B. 
C. 
D. 
Mathematics