exam Maths Puzzle Numerical Ability

find the equation that is perpendicular to line AB and line CD and goes through the midpoint

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exam Other Question

Factor the following into the product of two binomials. Then, confirm your answer is correct by multiplying the two binomials:

25y2 + 20y + 4
simplify:

3/x + 1/x+4 divided by 1/x + 3/x+4