exam Maths Puzzle Numerical Ability

Find (summation w/no limits) for the following set of numbers:
-3.5, -1.4, -0.5, 3, 5, 1, 2

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exam Other Question

how many different 4-digit numerals are there? (hint: zero cannot be used as the first digit) 10. Solve the following system both by graphing and then check result algebraically.
y = 8
2y = x^2