Solve the problem.How many 4-digit numbers can be formed using the digits 
if repetition of digits is not allowed?
A. 24
B. 23
C. 840
D. 2401
Answer: C
Mathematics
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Plot a slope field for the differential equation. Plot the particular solution of the differential equation that satisfies the given initial condition.y' = y + 2; y(0) = 1
A. 
B. 
C. 
D. 
Mathematics
The life expectancy E, in years, for a child born t years after 2000 is given by
.
In what birth year would a child have a life expectancy of 78.06 years?
?
A. 2010 B. 2008 C. 2006 D. That life expectancy never occurs.
Mathematics
Solve.A 51-foot piece of wire is cut into two pieces. One piece is twice as long as the other. Find the lengths.
Fill in the blank(s) with the appropriate word(s).
Mathematics
Subtract. Use borrowing, if necessary. 
A. 4966 B. 3856 C. 4144 D. 5166
Mathematics