exam Maths Puzzle Numerical Ability

Simplify
-10(2a - 6b)

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exam Other Question

Given a quadratic equation y = ax2 + bx + c, what is the effect of increasing the value of a on the parabola? What is the effect of decreasing the value a toward 0 on the parabola? Write the equation of the line, passes through (6,1) and is parallel to 4y-2x-1=0