exam Maths Puzzle Numerical Ability

Solve the system by addition.
x + y = 4
x - y = 10

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exam Other Question

Create a polynomial function that meets the following conditions:

Degree 4, 2 positive real zeros, 0 negative real zeros, 2 complex zeros.
Use the arithmic sequence of numbers 2,4,6,8,10.....to find the following:
a) What is d, the difference between any two consecutive terms
answer:
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b)