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If x² - 3x - 18 = 0 and y² + 9y + 18 = 0, which of the following is true?

If x^2 - 7x + k = 0 has roots that are equal, what is the value of k?

I. 4x² - 21 x + 20 = 0

II. 8y² - 22 y + 15 = 0

I. p² - 53p + 672 = 0

II. q² - 27q + 126  = 0

I. 2y² + 11y + 15 = 0

II. 3x² + 4x - 4= 0

I. x²= 961 

II. y= √961

I. 2x² + 5x + 2 = 0

II. 4y² = 1

I. 22x² - 97x + 105 = 0

II. 35y² - 61y + 24 = 0

I.  x² = 10                               

II.  y² - 9y + 20 = 0

Quantity I: The cash price of a notebook is Rs. 100 but is can also be purchased on 11 monthly equal instalments of Rs. 10 each. Find rate of S.I.?