Question

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Answer 1

a) A={1,2,3,4,5}
b) 13<$x^{2} -1$$\leq$90=>14<$x^{2}$$\leq$91=>$x^{2}$∈{16,25,36,49,64,81}=>B={4,5,6,7,8,9}
c)a∈{0,2,4,6,8}=>C={$2^{0},2^{2},2^{4},2^{6},2^{8}$}={1,4,16,64,256}
d)D={7,77,777,7777,77777}

Answer 2

a) A={1; 2; 3; 4; 5}; B={4; 5; 6; 7; 8; 9} b)C={1; 4; 4^1; 4^2; 4^3...} c) D={7; 77; 777; 7.777; 77.777}