I need help with a few math questions.?

Question

I know this isn't a homework answering website, but it's just a few questions. Please? Thank you in advance!

1: Which pair of rectangles is similar?
     A: https://static.k12.com/calms_media/media/243500_244000/243526/1/765292e13349e2b03df216aed4bb97e30e9089c8/VHS_PA_S2_01_L210_L310_Q5d.gif
     B: https://static.k12.com/calms_media/media/243500_244000/243526/1/765292e13349e2b03df216aed4bb97e30e9089c8/VHS_PA_S2_01_L210_L310_Q5d.gif
     C: https://static.k12.com/calms_media/media/243500_244000/243525/1/57af10f7fc4f7659a319052c23e468e6e1283591/VHS_PA_S2_01_L210_L310_Q5c.gif
     D: https://static.k12.com/calms_media/media/243500_244000/243518/1/ccf9d4e1160d1e394fa0963486d13539c329c842/VHS_PA_S2_01_L210_L310_Q5a.gif

My answer is A.

2: Tim has a picture frame that is 30 cm long and 24 cm wide. He wants to make a picture frame that is similar in shape but is 18 cm long.
 
How wide should this second picture frame be?

My Answer: 14.4 cm

3: The figures shown are similar.
 
What is the scale factor?

https://static.k12.com/calms_media/media/1299500_1300000/1299527/1/781b1062d78a1bb9c835059b58624d124776c27c/141093.jpg

A: 6/7
B: 4/7
C: 1/9
D: 3/7

My Answer: D: 3/7

4: The two figures are regular octagons.
 
What is the scale factor, written in decimal form?

https://static.k12.com/calms_media/media/1552000_1552500/1552119/1/f2e20d40cc7af0d4b7d908964365b157c1d53973/MS_IMB-1401023-100922.jpg

My Answer: I'm sorry. I don't get this question at all. :(

Please help?

? · Answer

PIcture links won't show any more on Yahoo. Sorry.

Tim has a picture frame that is 30 cm long and 24 cm wide. He wants to make a picture frame that is similar in shape but is 18 cm long.

How wide should this second picture frame be?

30/24 =  18/x

crossmultiply

30x = 432 
x= 432/30 = 14.4  Correct! :)
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I need help with a few math questions.?

1 Answer