exam Maths Puzzle Numerical Ability

3^x=40

e^0.04t=1500

please help me solve these... if possible...i need good step by step process

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exam Other Question

y-5x-3
4x+5y=-11 Someone please help me solve this problem, I am going to have similar ones on a test. Find three consecutive even intergers such that three times the second minus the third is 12 more than the first.