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

Equation Equation ? has one root x_{1} = 10. Determine the coefficient b and the second root x_{2}.

Discriminant Determine the discriminant of the equation: ?

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.

Product The product of two consecutive odd numbers is 899. What are this numbers?

Seats Seats in the sport hall are organized so that each subsequent row has five more seats. First has 10 seats. How many seats are: a) in the eighth row b) in the eighteenth row

Geometric progression 2 There is geometric sequence with a_{1}=-5.8 and quotient q=-2.2. Calculate a_{19}.