exam Maths Puzzle Numerical Ability

Please, help me. The Prof. gave us this problem but we don't have any book for the class. Please!!!
2.8=-log3.5
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Thank for helping me!

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exam Other Question
How do i graph this linear equation and is it a function

y=x-10 I need help on solving the problems -6 + (-5) and -17+(-14) and -5 over 6 + 9 over 16 and also -1.5 + (-2.3)