My friends tell me it's 10 but my calculator says its 25, but i think it's 15

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My friends tell me it's 10 but my calculator says its 25, but i think it's 15

f(x)= -sqroot x+3

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5/8 in decimal form

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The function f(x)=2•5^x can be used to represent the curve through the points (1,10), (2,50), and (3,250).

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