Ions are atoms or groups of atoms with positive or negative electrical charges. The charges of some ions are given. Use this information to find the total charge. 
2 borate ions and 9 sodium ions
A. -25
B. +15
C. +3
D. -15
Answer: C
Mathematics
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Find the eccentricity of the ellipse.x2 + 2y2 = 6
A. 
B. 
C. 
D. 
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Find the slope of the line.x = -10
A. 0 B. 1 C. Undefined D. -10
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Graph.3x + 4y = -20
A. 
B. 
C. 
D. 
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Find z1z2. Write your answer in standard polar form with the argument in radians.z1 = 4i, z2 = -6 + 6i
A. 24
B. 24
C. 24
D. 24
Mathematics