book Maths Puzzle Numerical Ability

Write in standard notation. 4.0364 x 10^-7

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Can you please help me solve this problem? I would greatly appreciate your help! Find each sum or difference, and show all work.</b>

2a/ 2a + 5 - 5/ 2a + 5

Thank you! Can you help me answer this question? The question is b=17/8 which is a fraction times h=90 how can I find the area of that kind of paralellogram.