Question

URGENTE matematica acima na foto. ​

Answer 1

Resposta:

8)  log12/5= log12-log5= log2.2.3-log5 = 2.log2+log3 -log5

log15 =log3.5 =log3+log5

log12/5+log15= 2log2+2log3 +log5-log5 = 2.0,30+2.0,48= 0,60+0,96 = 1,56

9) a)f(12) = 100.2^12/3 = 100.2^4= 100.16= 1600

b) f(t)= 400

400 =100.2^t/3

4= 2^t/3

2^2= 2^t/3

2= t/3

t=6