Solve the system by using Gaussian elimination with backward substitution or by reducing the matrix to reduced-row echelon form. 9x - 7y = -18 5x + 5y = -10
A. (-3, 1)
B. (-2, 1)
C. No solution
D. (-2, 0)
Answer: D
Mathematics
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Calculate the direction of 
and the midpoint of line segment P1P2.P1(8, -6, 4) and P2(9, -7, 5)
A. 
i + 
j + 
k; 
B. 
i - 
j + 
k; 
C. 
i - 
j + 
k; 
D. 
i - 
j + 
k; 
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Give the genus of the object. If the object has a genus larger than 5, write "larger than 5."Swiss cheese
A. genus 3 B. genus 0 C. larger than 5 D. genus 1
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Evaluate.-63
A. -18 B. 216 C. -216 D. 18
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Change the following mixed number to a fraction in the form 
, where a and b are integers and b ? 0.3
A. 
B. 
C. 
D. 
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