Question

СРОЧНО!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!​

Answer 1

$\sqrt{ \frac{15 - 4r}{8} }$

$ОДЗ: \frac{15 - 4r}{8} \geqslant 0$

$15 - 4r \geqslant 0 \\ - 4r \geqslant - 15 \\ r \leqslant \frac{15}{4}$

$r \leqslant 3 \frac{3}{4}$

rЄ(-∞; 3 3/4]