In a video game, Brian collects unbreakable gems, each of which has its own value. He earns 21 points when he collects 2 red gems and 3 yellow gems. He earns 31 points when he collects 2 yellow gems and 3 blue gems. He earns 23 points when he collects 2 blue gems and 3 red gems. When Brian collects 2 red gems, 2 yellow gems, and 2 blue gems, how many points does he earn?

will be cqual, if either \( b=0 \), or \( a^{3}+b^{2}+c^{3}-3 a b c-0 \). If \( a, b, c \) arc rational and \( a+b+c=0 \), show that the roots of \( (b+c-a) x^{2}+(c+a-b) x+ \) \( (a+b-c)=0 \) are rational.

\( 4 x^{2}+k x+5=0 \) has roots whose difference is \( \frac{1}{4} \)

4. Na natureza há bactérias que se multiplicam tão rapidamente que dobram de volume a cada minuto. Partindo-se de uma bactérias, sendo \( V(t) \) o volume de uma bactéria analisada após \( t \) minutos, e sendo \( V(t)=V_{0} \times 2^{t} \) a relação que fornece o volume da bactéria no instante t , onde \( V_{0} \) é o volume inicial da bactéria. Determine após quanto tempo, uma bactéria de volume inicial igual a \( 2 \mu \mathrm{~g} \) chega a \( 2048 \mu \mathrm{~g} \).

Which is equal to \( \frac{10}{2+i} ? \) A. \( 5-10 i \) B. \( 4-2 i \) C. \( 5+\frac{10}{i} \) D. \( 4+2 i \) E. \( 5+10 i \)

Which is equivalent to \( \frac{x^{3}}{\sqrt{x}} \) ? A. \( x^{3 / 2} \) B. \( x^{2} \) C. \( x^{5 / 2} \) D. \( x^{7 / 2} \) E. \( x^{6} \)