exam Maths Puzzle Numerical Ability

Need some help. 3 radical symbol x^2 = 4. This is what I got, but for some reason I don't think that's right, but I can't figure out where I went wrong. Can you please check and

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exam Other Question

10. Find an equation of the line containing the given point and perpendicular to the given pair of point

(-3, -8) and (-7, -2)

the equation of the line is y = what

18. Wri When x number of units are sold, the price of each unit (in dollars) is given p=-x/2 + 75. Find the unit price when the following quantities are sold: 2, 7, 9, 11.

Please anser