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What is the best way to answer questions with a x expression in the question. for example 3x + 10x=?

Consider the enlargement of the pentagon. what is the value of x, rounded to the nearest tenth? 2.1 centimeters 3.3 centimeters 7.0 centimeters 15.0 centimeters

The function below is written in vertex form or intercept form. rewrite them in standard form and show your work. y = 5(x+3)^2-4