book Maths Puzzle Numerical Ability

change log base 10 equals 4 to exponential form?

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book Other Question

Find the equation of each line. Write the answer in standard form using only integers.

The problem is:

The line through the points (-1,-3) and (2, -1).

Please help! I'm not sure how to get the square root of 16b^4
Could you help me? thanks!