exam Maths Puzzle Numerical Ability

If "a" is a negative number find
(a)+a+(-2a)+(-a)

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exam Other Question

Find an equation in slope-intercept form passing through the points (2,5) and (7,-3)

Any help will be appreciated. USE THE QUADRATIC FORMULA TO SOLVE:

x^2 - x/1 =1
2

*Note. Problem reads, x Squared over 2, minus x over 1 = 1
Use Quadratic Formula To solve