Asked by Delilah

Use cross products to see if each pair of ratios forms a proportion. Replace each box with = or ≠.
1.
7/5 ? 15/10

=
≠

2.
6/8 ? 15/20

=
≠

Solve each problem.
3.
2/3 = 1.2/x

x = 18
x = 1.8
x = 0.2
x = 10

4.
4/5 equals 8/x plus 2

x = 4
x = 9.5
x = 2
x = 8

Create a proportion and solve.

5.
A recipe uses 3 cups of flour to make 48 cookies. How much flour is needed to make 72 cookies? (1 point)

3/48 = 72/x, x = 1,152 cups
3/48 = x/72, x = 4.5 cups
3/48 = x/72, x = 2 cups
x/48 = 3/72, x = 2 cups


Here are my answers. Are they correct? Thanks!
1. ≠
2. =
3. 1.8
4. x = 8
5. 3/48 = x/72, x = 4.5 cups
Answered by Ms. Sue
Yay! All are right!
Answered by Delilah
Thanks! You're really truly the best!
Answered by Ms. Sue
You're very welcome!

But YOU did these problems! :-)

Answered by Iliza
Ms.Sue ur very nice
Answered by Shawn Mendes is bae
1. ≠
2. =
3. 1.8
4. x = 8
5. 3/48 = x/72, x = 4.5 cups
100%
Answered by CorrectInator
I hereby dub thee- CORRECT!
Answered by Mariana W.
Thank you! 5/5 100% thank you CORRECTINATOR and Shawn Mendes Is Bae are correct! GREAT JOB Delilah! :D
Answered by Salted Caramel
They are right!!! I got a 100%!
Answered by Bapper
Yay! Thanks guys :)!
Answered by Cuddlefish <3
Thank you, all of you! 5/5, 100%!!!
Answered by Ethan's bae and I have no friends
Wait I got different ones from three down
Answered by Anne Onimus
Correct!!!!!!!!!!!!!!!!!!!!!!!!!!!!tHNX
Answered by Anonymous
3. (A) x=18
4. (D) x=154
5. (B) 30
Answered by I'm the man
Thank you anonymousanonymous for the clear up of the last questions
Answered by Kayla the connexus kid
im in 6th grade . . .
Answered by Josephine
Me too Kayla
Answered by Kokichi
I love how some of these are super positive and everyone is happy and the next thing you know, you check another question, and everyone is ranting and yelling at each other lmaO
Answered by Blackbird
Thanks everyone!!!!
Answered by crafty
100%
Answered by Jim
I am taking the test right now, and I am really smart, So here are the right answers.

Lesson 2: Proportions, Connections Academy
******* Math Grade 8 A Unit 5: Applications of Proportions

Multiple Choice

Use CROSS PRODUCTS to see of each pair of ratios forms a proportion. Replace each box = or ≠.

1. 7/5 ? 15/10
Answer: ≠
Explain: Use CROSS PRODUCTS! 7*10 is equal to 70 and 5*15 is equal to 75. Therefore, the two products do NOT form a proportion.

2. 6/8 ? 15/20
Answer: ≠
Explain: Use CROSS PRODUCTS! 6*20 is equal to 120 and 8*15 is also equal to 120. Therefore, the two products are proportions.

Solve each problem.

3. 2/3 = 1.2/x
Answer: x = 1.8
Explain: We now know that we had to use cross products before. We can still use cross products for this equation. We know that 3*1.2 is equal to 3.6, but we don't know what 'x' is. In order to find out what 'x' is, we have to divide 3.6 by 2 sense that is the only number we have not used yet. 3.6/2 is 1.8. That is how I got the answer of '1.8'.

4. 4/5 = 8/x + 2
Answer: x = 8
Explain: We can still use the cross products method with this. We know that 4*5 is equal to 40, but we don't know what 'x + 2' is. Now we have to find out what times 4 gives us 40, then we have to subtract 2 from that number because we want to dot he opposite of the operation given which is subtraction. So 4*10 is 40, but we are not done yet --- 10 is the number multiplied by 4 to get us 40, so 10 - 2 is 8. That is how I got the answer of 8.

Create a proportion and solve.

5. A recipe uses 3 cups of flour to make 48 cookies. How much flour is needed to make 72 cookies?
Answer: 3/48 = x/72, x = 4.5 cups
This one is pretty self explanatory, so I will just post the answer choices and you will see what I mean.
A. 3/48 = 72/x, x = 1,152 cups - The amount of cups needed won't even be over 100.
B. 3/48 = x/72, x = 4.5 cups - This is the only answer choice that makes sense.
C. 3/48 = x/72, x = 2 cups - The amount of cups needed is already 3 in the question.
D. x/48 = 3/72, x = 2 cups - The amount of cups needed is already 3 in the question.

This leaves us with the only answer choice that makes sense; B. 3/48 = x/72, x = 4.5 cups






Answered by Jim
That was for whoever got stuck or just want to check answers.
Answered by Jim
Make sure you read the ENTIRE thing. It will NOT make sense if you skip over some words or skip the explanation.
Answered by Rose n
Thanks Jim
Answered by HelpGirl101
Hi,

Just came to check in and I am SOOOOO proud of everyone for being supportive to each other and not getting off topic...

Keep it Up!!!
HelpGirl101
Answered by UWO
1. ≠
2. =
3. 1.8
4. x = 45
5. 3/48 = x/72, x = 4.5 cups

"shawn mendes is bae" is correct, except now the answer to 4 is x = 45

:) the question changed ig
Answered by Anonymous
if you got 4 5 6 i got you did it today 100%
4 8/15 24/ x answer is 45
5 other people got it
6 No, because one has a quotient of 0.6
i 9 grade
Answered by Vaporwave is the best music
Uwo is correct
Answered by baf
he right in 9th also
Answered by .......
Yes
Answered by Your local trash can
Thank you UWO
Answered by Ιωσήφ Ο Ευγενής
100$ thx
Answered by Ιωσήφ Ο Ευγενής
*100%
typo
Answered by Limelight
Life savers why don't is everything 😯😯😯😯😯😯
Answered by koolkid
@UWO is correct, thx!!
Answered by Correct @2020
For 8TH Grade ONLY
1. ≠
2. =
3. (A) x=18
4. (D) x=154
5. (B) 30
100% 5/5
Answered by Student from ms. Lanier class
1. ≠
2. =
3. 1.8
4. 45
5. 4.5
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