Bobby’s uncle gave him 300 baseball cards. each week, bobby purchases 40 baseball cards to add to his collection.

which inequality can be used to find w, the number of weeks after starting his collection when bobby will have more than 700 baseball cards in his collection?

a)
300w + 40 > 700

b)
300w + 40 < 700

c)
40w + 300 > 700

d)
40w + 300 < 700

C )   40w + 300 > 7--

Step-by-step explanation:

Since he starts off with 300 cards, the equation must have +300 units. As he purchases 40 each week, the rate of change is 40w. Since his goal is over 700, look for >700.

Therefore 40w + 300 > 700

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.