Question

1)Rez ecuatia 2(x+3) = 1
2)l triunghiului = 4√3 cm
Aflati aria triunghiului
3)75% din 4000

Answer 1

$1)2*(x+3)=1 \\ 2x+6=1 \\ 2x=1-6 \\ 2x=-5 \\ x= -\frac{5}{2} \\ x=-2,5. \\ 2)l=4 \sqrt{3}cm \\ A= \frac{ l^{2} \sqrt{3} }{4} \\ A= \frac{48 \sqrt{3} }{4} \\ A=12 \sqrt{3} cm^{2} \\ 3) \frac{75}{100}*4000= \frac{300000}{100}=3000.$

Answer 2

$\displaystyle 1).2(x+3)=1 \\ 2x+6=1 \\ 2x=1-6 \\ 2x=-5 \\ x=- \frac{5} {2} \\ \\ 2).l=4 \sqrt{3} ~cm \\ A= \frac{l^2\sqrt{3} }{4} = \frac{(4 \sqrt{3} )^2 \cdot \sqrt{3} }{4} = \frac{48 \sqrt{3} }{4} =12 \sqrt{3} ~cm^2 \\ \boxed{A=12 \sqrt{3} ~cm^2} \\ \\ 3). \frac{75}{100} \cdot 4000= \frac{300000}{100} =3000$