exam Maths Puzzle Numerical Ability

Please, I need help for this.
Log T = -2.242
Thanks!!

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exam Other Question

Perform the indicated operation:
a. (8x3 - 3x2 + 7x - 5) + (-2x3 - 3x - 10)

b. (8x3 - 3x2 + 7x - 5) - (-2x3 - 3x - 10) Tutor can you help me please...thank you***

This is from a set of problems from Algebra and Trig Book: Exponential and Logarithmic functions by Beecher at Northern Virginia Comm