exam Maths Puzzle Numerical Ability

When fifteen is subtracted from four times the sum of seven and twice some number, the result is 45

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exam Other Question

Depreciation on Office Equipment is $4,700.00. What is the adjusting entry on December 31, 2007?
if u can help me with this.thank you
multiply, multiple choice:

-3a^2b 14a^3b^2
------ * ---------
35a^5 -9b^4

Answers:
a)9/6

B)2b/15

C)9/15

D)2/15b

I am very confused on this pro