Homework Help: 7th grade math Ms.Sue please!

Posted by Delilah on Friday, October 26, 2012 at 8:41pm.

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

7th grade math Ms.Sue please! - Ms. Sue, Friday, October 26, 2012 at 8:50pm
Yay! All are right!
7th grade math Ms.Sue please! - Delilah, Friday, October 26, 2012 at 8:51pm
Thanks! You're really truly the best!
7th grade math Ms.Sue please! - Ms. Sue, Friday, October 26, 2012 at 8:52pm
You're very welcome!

But YOU did these problems! :-)
7th grade math Ms.Sue please! - Iliza, Wednesday, November 28, 2012 at 6:00pm
Ms.Sue ur very nice

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