- THIS IS MY QUESTION NOT AN ANSWER?

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Determine the quadratic function whose graph is given.
The vertex is (−1, −1).
The y-intercept is (0, 4).? HELP!!
calculate the frequency of the photon emitted when the electron in a hydrogen atom drops from energy level E6 to energy level E3? Solve the following equations: a) 6sinX - 3 = 1 - 2sinX b) 2sinXcosX = 0? Identify the oxidising and reducing agents in Cu+HNO3? Find out the sum of first "n" numbered natural odd number's squares....I mean
1^2+3^2+5^2+.......n^2=?
Sorry for my bad English.?