exam Maths Puzzle Numerical Ability

Tutor could you help me please with this problem?
Thank you very much!


13a-15b-a+2b=

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exam Other Question

Find the numbers corresponding to the given logarithms:
1. 0.81293
2. 27631-10
3. 8.05733-10
4. 7.38471

What are the logarithms of the numbers:
1. 2346
2. 0.0009358
3. 89
9*9=X
X=?