exam Maths Puzzle Numerical Ability

Find the digit wherein twice of it was exceed by 6 and its sum is three less 5 times the digit.

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exam Other Question

Determine the algebraic rule for the line that:
satisfies f(0) = -2 and f(4) = 5 Can someone show me how to Multiply and then simplify the product (square root). All variables represent positive real numbers. Thanks

(√7+1)(√2-4)