Answer A is the correct answer.

If your teacher has a different answer on the markers sheet ask that it be corrected.

You may use the evidence below.

Bob

ps.

41.4 divided by 9 gives be 4.6 and when I check it it is correct why do they give us such weird decimal confusing numbers it confuses me and it gets annoying

Yes, you are right. If shape A is transformed into B using a scale factor the correct way to compute the sf is to calculate B/A.

I don't know why they have this back to front, but you can get their answers by doing A/B so it looks like you'll have to live with this. Just be prepared to do it properly when you meet scale factors elsewhere!

]]>5. A because 9/41.4 gives me 0.2173913

but when I check it its wrong

5. A = 9, 10, 16, 19 B = 41.4, 46, 73.6, 87.4

A Prop, s.f. = 0.217

B Prop, s.f. = 0.318

C Prop, s.f. = 0.421

D Not prop

E Prop, s.f. = 0.294

F Prop, s.f. = 0.721

Not necessary.

.2439 can be rounded to .244. That is why I like A.

]]>That is what I got too. Did you check it?

]]>I got A as correct but like I rounded 0.2439 to 2440 is that a correct option? or is there another way to get the answer.

A Prop, s.f. = 0.244

B Prop, s.f. = 0.215

C Prop, s.f. = 0.284

D Prop, s.f. = 0.297

E Prop, s.f. = 0.236

F Prop, s.f. = 0.212

If the second shape has got smaller you want a fraction for the scale factor and if it has got bigger you want a number over 1.

Yet it seems your course teachers have this back to front ???

No problem as long as the questions are consistent about this.

Bob

]]>I divided 7/28.7 and got 0.2439024 in the calculator but when I did it I got 4.1

You went backwards on that calculation with the calculator?

]]>A = 7, 7, 21, 23 B = 28.7, 28.7, 86.1, 94.3

I choose A and I am still kind of confused because I divided 7/28.7 and got 0.2439024 in the calculator but when I did it I got 4.1

A Prop, s.f. = 0.244

B Prop, s.f. = 0.215

C Prop, s.f. = 0.284

D Prop, s.f. = 0.297

E Prop, s.f. = 0.236

F Prop, s.f. = 0.212