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!

d. 9

step-by-step explanation:

in the table given in the picture, x is the input of the function and f(x) is the output on the given input. in the given table, it can be read as the value of function at -3 is it's respective value of f(x) which is -9.

as we have to find the value of f(3), we will see that what is the value of output on input 3. we can see in the table that the output value at x=3 is 9.

so, option d is the correct answer ..

  or  

step-by-step explanation:

if the four friends split the cost, p, of the pizza evenly, then each friend pays one-fourth of the cost of the pizza.

the expression is   or