Question

Ayuda por favor!!!!!!!

Answer 1

Respuesta:

A.

$\frac{1}{f} =\frac{1}{d} +\frac{1}{d} \\\\\frac{1}{f}=\frac{2d}{d^{2} }$

$\frac{1}{f}=\frac{2}{d}\\  \\\frac{d}{1} =2f\\\\d=2f$

$\frac{d}{2} =f$

B.

$p=\frac{m}{\frac{1}{3}\pi r^{2}h   } \\\\\frac{1}{3}\pi  r^{2}h.p=m\\\pi r^{2}h.p=3m\\  r^{2}=\frac{3m}{\pi h.p} \\\\ r=\sqrt{\frac{3m}{\pi h.p} } }$