exam Maths Puzzle Numerical Ability

Remove the parentheses in each of the following expressions and simplify when possible.
8d - (-7c -2d)

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exam Other Question

Solve the Following:

x-2y=2
2x-z=-2
x-y-2z=4 6. A circle of radius 5 has its center on the line 3x � 2y + 6 = 0 and the circle is tangent to the y axis. Find its equation. (There are two solutions.)