Use the zero and negative exponent rules to simplify the expression.2-6
A. 64
B. -64
C. 
D. 
Answer: D
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Find the vertices of the ellipse.
+ 
= 1
A. (2 + 3
, -2), (2 - 3
, -2)
B. (- 3
, -2), (3
, -2)
C. (-4, -2), (8, -2)
D. (6, -2), (-6, -2)
Find the exact value of the expression.
A. 
B. 
C. - 
D. - 
Use the Gauss-Jordan method to solve the system of equations. If the system has infinitely many solutions, let the last variable be the arbitrary variable.x - 8y + z = 23x - y + 2z = 6
A. 
B. 
C. ?
D. 
Solve the problem. First use front end rounding. Then find the exact answer.There are 27,878,400 square feet in one square mile. How many square feet are there in 68 square miles?
A. Estimate: 1,960,000,000 square feet; exact: 1,895,704,000 square feet B. Estimate: 1,960,000,000 square feet; exact: 1,895,731,200 square feet C. Estimate: 2,100,000,000 square feet; exact: 1,895,731,200 square feet D. Estimate: 2,100,000,000 square feet; exact: 1,895,704,000 square feet