#1)Which ratio forms a proportion? Use cross products to test each pair.
(A)15/40, 35/90
(B)18/22, 45/55
(C)12/55, 33/121***
(D)17/31, 32/45
#2)Which ratio forms a proportion with 20/30? Use equivalent ratios to test each pair.
(A)16/24
(B)10/20***
(c)17/51
(d)15/60
#3)Which ratios form a proportion? Use equivalent ratios to test each pair.
(A)4/9, 2/3
(B)6/15,9/12***
(C)12/16, 15/20
(D)18/20, 24/30.
Are my answers correct? If not, which ones are wrong?
this site is confusing
1.B
2.D
3.A
THESE ARE THE CORRECT ANSWERS FOR UNIT:6 LESSON:5
MAY IS WRONG! I GOT A 40 BECAUSE OF HER!
#1 I meant to put (C)15/55 not the 12.
12/55 = 33/121
1452 = 1815 -- Nope!
2, no
3. no
OK so if I did all wrong, #1 would be A. #2, D, and #3 also D.. Right? @Ms.Sue
omg
To determine if two ratios form a proportion, we can use cross products or equivalent ratios.
For question #1, let's use cross products to test each pair of ratios:
(A) Cross product: 15/40 * 90/35 = 1350/1400
(B) Cross product: 18/22 * 55/45 = 990/990
(C) Cross product: 12/55 * 121/33 = 1452/1815
(D) Cross product: 17/31 * 45/32 = 765/992
The ratio that forms a proportion is (B) 18/22, 45/55 because the cross products are equal.
For question #2, let's use equivalent ratios to test each pair of ratios with 20/30:
(A) Equivalent ratio: 16/24 = 20/30
(B) Equivalent ratio: 10/20 = 20/30
(C) Equivalent ratio: 17/51 ≠ 20/30
(D) Equivalent ratio: 15/60 ≠ 20/30
The ratio that forms a proportion with 20/30 is (B) 10/20 because it is equal to 20/30.
For question #3, let's use equivalent ratios to test each pair of ratios:
(A) Equivalent ratio: 4/9 ≠ 2/3
(B) Equivalent ratio: 6/15 = 9/12
(C) Equivalent ratio: 12/16 = 15/20
(D) Equivalent ratio: 18/20 = 24/30
The ratio that forms a proportion is (B) 6/15, 9/12 because it is equal to each other.
Based on the explanations above, your answers for question #1 and #2 are correct, but your answer for question #3 is incorrect. The correct answer for question #3 is B) 6/15, 9/12.