Question

PLEASE HELP IMMEDIATELY
ANSWER THESE 2 QUESTIONS ​

Answer 1

15.

$(i) {5}^{ - 2} \\ = \frac{1}{ {5}^{2} } \\ = \frac{1}{25} \\ (ii)( - 5 {)}^{2} \\ = 25$

16.

$1 + {2}^{ - 1} + {3}^{ - 1} + {4}^{0} \\ = 1 + \frac{1}{2} + \frac{1}{3} + 1 \\ = \frac{6 + 3 + 2 + 6}{6} \\ = \frac{17}{6}$