Question

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Answer 1

so here radius is 28cm and

diameter is 56cm

2) i)

$(3x + 4)(3x - 4)$

$(x + y)(x - y) = x {}^{2} - y {}^{2}$

$= (3x) {}^{2} - 4 {}^{2}$

$= 9x {}^{2} - 16$

ii) 53× 47= 2491

HOPE IT HELPS YOU!!