exam Maths Puzzle Numerical Ability

For the following set, which number has the largest absolute value?
4, -1, 12, -20, 19, 0

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exam Other Question

please factor this polynomial

3y^2-y-2 Hey, I was wondering you you solve radical equations such as this.
3 to the square root of 2x+3 = the square root of x-7

And also, what is a exponential decay?