exam Maths Puzzle Numerical Ability

Find the value of k so that 2x^2-kx+5=0 has one real rational root.

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exam Other Question

The edge of a 4-meter long ladder is 3.5 meters from the base of a building. Will the top of the ladder reach a window that is 3.8 meters from the ground? Can you also explain it? Write the fraction in simplist form.

28x to the 5th power y cubed OVER -21x cubed y to the 4th power

7x - 21 OVER x squared + x - 12