Roots Determine the quadratic equation absolute coefficient q, that the equation has a real double root and the root x calculate: ?

Variations 4/2 Determine the number of items when the count of variations of fourth class without repeating is 552 times larger than the count of variations of second class without repetition.

Quadratic equation Quadratic equation ? has roots x_{1} = -47 and x_{2} = -79. Calculate the coefficients b and c.

Discriminant Determine the discriminant of the equation: ?

Combinations How many elements can form six times more combinations fourth class than combination of the second class?

Combinations From how many elements we can create 990 combinations 2nd class without repeating?

Quadratic function 2 Which of the points belong function f:y= 2x^{2}- 3x + 1 : A(-2, 15) B (3,10) C (1,4)

Cinema 4 In cinema are 1656 seats and in the last row are 105 seats , in each next row 3 seats less. How many are the total rows in cinema?