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 10 Describe the multiples of $21$ that ends with $241$ 3 $f>0$ is a integrable function, How to prove that $\int_a^bf(x)dx>0$ 3 Give examples of functions that satisfy all but one property of metrics 3 Vector space $V = V^{\bot}\oplus W$, prove $W$ is “hyperbolic” 2 Prove that $\int \vert \ \vert f_n\vert-\vert f_n-f\vert^p -\vert f\ \vert \ \vert d\mu \to 0$, if $\sup_n\vert f_n \vert\leq C$

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 4 Can we remove the absolute value from inequality $|a-b|<ε$? 2 Why do similar matrices represent the same linear transformation? 2 Give examples of functions that satisfy all but one property of metrics 2 Divide $(x+1)^2$ by $x-1$ without using longdivision. 1 Is this a sufficient proof for "For all $k \in\Bbb R$, if $k$ is odd, then $4k + 7$ is odd

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