If st = 2x and pr = 28, what is the value of x?

What is 140% of 25? because i need

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Nellie is analyzing a quadratic function f(x) and a linear function g(x). will they intersect? f(x) g(x) graph of the function f of x equals one half times x squared, plus 2 x g(x) 1 5 2 10 3 15