- Twice Differentiable function?

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What is the basis for the normal curve and inferential statistics? Can someone show me step by step how to do number 12. The answer is 9 but I keep getting 7!? Is3/4 equivalent to 9/16? What is the answer to sec^2tan^2-sec^2+1=tan^4? I took my menengitis shot 2/2012 & took it again in 12/23/16. I was wondering if the shot is valid to be able to enroll in college courses.?