7. Solve the following system of equations:

2x + 4y + 10z

x - 2y + 5z = - 4

3x - 4y - 3z = 15

Select the appropriate response:

A) x = 2, y = 3, z = 5

B) x = 4 y = 3, z = 5

C) x = 2, y = 3, z = 9

D) Not possible to solve

6 Σ (4n + 2) n=1 The number of terms in the series above

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