Solve the problem.Eight horses are entered in a race. In how many ways can they cross the finish line if ties are not allowed?
A. 8
B. 8 ? 7? 6 ? 5 ? 4 ? 3 ? 2
C. 28
D. 88
E. none of these
Answer: B
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Solve the problem.A certain radioactive isotope decays at a rate of 2% per 200 years. If t represents time in years and y represents the amount of the isotope left, use the condition that 
to find the value of k in the equation 
A. -0.02020 B. 0.00010 C. 0.01332 D. -0.00010
Rewrite the polynomial in descending order.-10 + 7x2 + 6x6 + 3x3 - x
A. -10 + 7x2 + 6x6 + 3x3 - x B. 6x6 - x + 3x3+ 7x2 - 10 C. 6x6 + 3x3 + 7x2 - x - 10 D. -10 - x + 7x2 + 3x3 + 6x6
Solve the problem.
Let x = 28 and y = 7. Find the pitch of the roof.
A. 
B. 
C. 
D. 
Solve the problem.A tutor charges $79 for a tutoring session that lasts for t hours. Complete the table to help find an expression that describes the cost (in dollars) per hour. (Show the arithmetic in order to see a pattern.)
A. 
B. 
C. 
D. 