Please help me with two problems:

Pics coming in comments

Question

Please help me with two problems:

Pics coming in comments

anonymous · Answer

attachment

anonymous · Answer

Solve for x given that the polygons are similar.

anonymous · Answer

ok, this one is fun. 3 x 5 is = 12 x 9+x. 3 to 12 = 4 3 x 4 = 12. so, 5 x 4 = 20.
subtract 9 from that and your answer is 11. hope i helped :)

anonymous · Answer

thanks buddy

anonymous · Answer

Solve for x given that the polygons are similar.

anonymous · Answer

alright, this second one is tricky. because the ratio of the lengths is 9:10 you may want some help from another person? or are you being timed?

anonymous · Answer

no, it is just online homework. The online instructor does not explain  well

anonymous · Answer

I see. Im not that good with ratios I'm sorry :c

anonymous · Answer

That's okay, thanks for help anyway

nikato · Answer

you know the ratio A:B is 9:10
and you are given the length of one side for A and B

if you were to write it as A:B, it would be 4x+18:100

nikato · Answer

now set up the proportion

$$\frac{ 4x+18 }{ 100 }=\frac{ 9 }{ 10 }$$

nikato · Answer

now cross multiply

10(4x+18)= 9(100)

can you solve for x from here?

anonymous · Answer

x=18

nikato · Answer

correct

anonymous · Answer

Thank you @nikato

nikato · Answer

no problem