HELP ASAP!! Use cross products to determine which are valid proportions. Proportion
Not a Proportion
2/3 and 9/12
3/8 and 6/141
18/8 and 9/4
775 and 27/20
4/7 and 10/17.5

Proportions:

18/8 and 9/4

4/7 and 10/17.5

Everything else is not a proportion

Step-by-step explanation:

To find if two fractions are a proportion, we need to set each up as a fraction. Then, we multiply both diagonal values. If we get the same value, they are proportionate.

and :

So these aren't proportionate.

and :

So these aren't proportionate either.

and :

So this is proportionate.

(since 775 is just that over 1) and :

So this isn't proportionate.

and

So this is proportionate.

Hope this helped!

es una operación aritmética.

step-by-step explanation:

no se que fórmula requiera, pero te puedo decir que es adición. deberías revisar porque tema vas y ver que fórmulas puedes aplicar.

answer: i guess 5 units?

step-by-step explanation: