exam Maths Puzzle Numerical Ability

log (10,000)=?

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exam Other Question

Simplify the expression, and combine like terms.
11). -9 + 5(4 - 9m)

Solve the equation.
12). n/5 = 15

Write the phrase as an algebraic expression, using x for any unknow Write a quadratic equation in the variable x having the given numbers as solutions. Type the equation in standard form, ax^2 + bx + c = 0.

Solution: 5, only solution

I am confused with trying to back into the equation from the solution.