Question

na função f(x)=2x,o valor de f(x)=6, será?​

Answer 1

Resposta: e) 64

f(x) = 2 elevado a x

f(6) = 2 elevado a 6

f(6) = 2.2.2.2.2.2 = 64

Answer 2

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$\large\boxed{\begin{array}{l}\rm 1)~\sf f(x)=2^x\\\sf quando~x=6~temos:\\\sf f(2)=2^6=64\\\huge\boxed{\boxed{\boxed{\boxed{\sf\maltese~alternativa~e}}}}\end{array}}$

$\large\boxed{\begin{array}{l}\rm 2)~\sf P(t)=k\cdot2^{0,05t}\\\sf vamos~considerar~1990~como~t=0,dessa~forma~teremos:\\\sf P(0)=k\cdot2^{0,05\cdot0}\\\sf P(0)=k\\\sf P(0)=300~000\\\sf passado~10~anos,teremos~o~ano~2000, isto~\acute e\\\sf P(10)=300~000\cdot2^{0,05\cdot10}\\\sf P(10)=300~000\cdot2^{\frac{1}{2}}\\\sf mas~2^{\frac{1}{2}}=\sqrt{2}\approx1,4\\\sf p(10)=300~000\cdot1,4\\\sf P(10)=420~000\\\huge\boxed{\boxed{\boxed{\boxed{\sf\maltese~alternativa~b}}}}\end{array}}$

$\large\boxed{\begin{array}{l}\rm 3)~\sf\dfrac{3\pi\div3}{6\div3}=\dfrac{\pi}{2}=90^\circ\\\sf portanto~x=90^\circ\\\huge\boxed{\boxed{\boxed{\boxed{\sf\maltese~alternativa~c}}}}\end{array}}$

$\large\boxed{\begin{array}{l}\rm 4)~\sf sen(30^\circ)=cos(60^\circ)=\dfrac{1}{2}\\\sf tg(45^\circ)=1\\\sf sen(30^\circ)+cos(60^\circ)-tg(45^\circ)=A\\\sf A=\dfrac{1}{2}+\dfrac{1}{2}-1\\\sf A=1-1=0\\\huge\boxed{\boxed{\boxed{\boxed{\sf\maltese~alternativa~a}}}}\end{array}}$

$\large\boxed{\begin{array}{l}\rm 5)~\sf225^\circ\in 3^{\underline o}~quadrante\\\huge\boxed{\boxed{\boxed{\boxed{\sf\maltese~alternativa~c}}}}\end{array}}$