exam Maths Puzzle Numerical Ability

Hi,
Can you help me with this math problem?

18.) Find the value of the logarithmic function.

log4(1/4)

The answer should be -1

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exam Other Question

Please clarify the solution for me. Thank you

find the product
(10+7x)^2

I believe it is 100+49x^2 is this correct? How many gallons of a 70% alcohol solution must be mixed with 50 gallons of a 20% solution to obtain a solution that is 60% alcohol