book Maths Puzzle Numerical Ability

wat is -4(5c+7)-3c+13

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book Other Question

If a regular polygon has an ecterior angle of 18 degrees, how many sides would that polygon have?

and

If a regular polygon has an interior angle of 135 degrees, how many sides would that polygon have?

Please help me
Reanne What is the x-intercept of the line with the equation 4x + 2y=12? Please help me, Please!