help!

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Question

help! 

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john_es · Answer

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

anonymous · Answer

your link opens a blank gmail account

anonymous · Answer

oops sorry

john_es · Answer

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