Question

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Use cross products to see if each pair of ratios form a proportion replace each box of the equal or unequal to sign
1. 7 over 5 equal or unequal to 15 over 10
2. 6 over 8 equal or unequal to 15 over 20
solve each problem
3. 2 over 3 equals 1.2 over x
4. 4 over 5 equals 8/x + 2
create a proportion and solve
5. a recipe uses three cups of flour to make 48 cookies how much flour is needed to make 72 cookies

Answer 1

To use the cross product you just have to multiply the diagonals and see if you get the same number

So #1is no unequal
You do the same thing for #2

#3


then you just solve for x
2x=3.6
x=1.8

You do the same thing for #4

#5
To set up the proportion you have to set it up like this:

So you get

Then you just solve for x like in #3 & 4