Question

help!

https://mail-attachment.googleusercontent.com/attachment/u/0/?ui=2&ik=d37bb070c3&view=att&th=14137ed95a7808c1&attid=0.1&disp=inline&realattid=f_hlsft2rn0&safe=1&zw&saduie=AG9B_P-EofS37sHHGtd3RRwQqy_8&sadet=1379681358309&sads=vKsmNCHTTHO3WQw-A-e2RaIuls0&sadssc=1

Answer 1

You must post an image or the problem itself, not a link to a mail account.

Answer 2

your link opens a blank gmail account

Answer 3

oops sorry

Answer 4

(6)
\[\frac{(x+20)}{2}=3x\\
x+20=6x\Rightarrow 20=5x\Rightarrow x=4\]
(7)
\[x+150+128=450\Rightarrow x+278=450\Rightarrow x=172\ cm\]

(8)
\[x+0.05x=15\Rightarrow x=15/1.05=14.29$\]