- Integral question = lim n→∞ i=1 "weird mark" ^n f(xi)* (Δx), when f(x) = cos x , and x ~[0, π/2] .?

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Two numbers, a and b, are such that a>b. Their sum is 49. Write an equation to represent this information. Would it still be a+b=49? How is functions, integrals and derivative useful in work industries? Thank you kindly :)? Which salt is more soluble, KCl or NH4Cl? Why? How do you plot the the seventh root of unity? what does it look like on a unit circle like the one in the attachment? IMPOSSIBLE math problems?