1 Calculate: (a) 20 x 47 = 2 x 10 x 47 = 2 x 470 =
(b) 30 x 56 = 3x 10 x 56 =
(c) 50 x 39 =
(d) 74 x 60 =

step-by-step explanation:

it's is b

solution:

the given function is ,

      =

the three roots of this quadratic function is , 0 ,8 and 10.all the roots are real and rational.

if a quadratic equation is of the form ,

sum of the roots = a + b +c= 0+8+10=18=  

product of roots taken two at a time = a b + b c+ c a = 0+80+0=80 =  

product of roots = a b c = 0=  

there are 11 doors in a hall starting from 0 to 11.the entry in the hall is permitted through gate number 0 and exit is allowed through only gate number 8 and 10.so, three roots(0,8,10) of quadratic function is given by entry and exit route of this hall.

4 candies

step-by-step explanation:

7 x 28 = 196

200 - 196 = 4 candies remaining.