Question

Помогите плиз очень срочно !!

Answer 1

3

$16leq 2^{x+3}$

$2^4leq 2^{x+3}$

$4leq x+3$

$xgeq 1$

4

$5^{7x+3}-frac{1}{5}geq 0\\ 5^{7x+3}geq frac{1}{5}$

$5^{7x+3}geq 5^{-1}\ \ 7x+3geq -1\ \ xgeq- frac{4}{7}$