exam Maths Puzzle Numerical Ability

what is the domain of this y=2x-1

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exam Other Question

The product of two consecutive numbers is 42. Which equation can be used to find the two numbers?

F. n(n+1)= 42
G. n(n+2)= 42
H. n+(n+1)=42
I. 2n(n+1)=42
Please solve. Thanks!

Y=X^2^+4x+4