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could you show the steps too?

It's a question in proportions. 1800 is to 25000 as 1600 is to x. Are you with me so far?

yes

but im not supposed to use proportions

its for variations like this is a direct variation

"varies directly" is the same as proportions. You will use an equation like a/b = c/x.

1800 = a. 25000 = b. 1600 = c. Just get x

25000/1800 = x/1600
25000/1800 = 13.89
1800 x 13.89 = 25
1600 x 13.89 = x

the equation they gave to use to use was y=kx ^{n} \]

y=kx squared to n

What is your value for k?

that what i dont know