exam Maths Puzzle Numerical Ability

Find equation for a line Express answer using slope intercept perpendicular to the line y=2x-5 points (-1,-2) how do I do this problem?

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exam Other Question

Given the algorithm,

1. pH = - log[H+]
2. H+ = 10-pH

where pH is acidity level and H is hydrogen ion concentration

Find [H+] for condensed milk with 6.3 pH.

Make
Simplify: No negative exponents and no decimal answers.
(27a^3b^2c^5/45a^4c^2)^3