Question

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Answer 1

$1)\frac{13}{16}-\frac{22}{4}=\frac{13}{16}-\frac{88}{16}=-\frac{75}{16}\\\\2)\frac{22}{4}*\frac{13}{16}=\frac{11*13}{4*8}=\frac{143}{32}=4\frac{15}{32}\\\\3)1+4\frac{15}{32}=5\frac{15}{32}\\\\4)tgA=\frac{-\frac{75}{16} }{5\frac{15}{32} }=-\frac{75}{16}:\frac{175}{32}=-\frac{75}{16}*\frac{32}{175}=-\frac{3*2}{7}=-\frac{6}{7}$