An electronic store makes a profit of $25 for every portable dvd player sold and $55 for every dvd recorder sold the managers target is to make at least $225 a day on sales of the portable dvd players and dvd recorders write an inequality that represents the number of both kinds of dvd players that can be sold to reach orbit the cells target let p represent the number of portable dvd players and r represent the number of dvd recorders

Step-by-step explanation:

P = number of portable DVD players; profit: $25 each

R = number of DVD recorders; profit $55 each

Profit for all portable DVD players sold: 25P

Profit for all DVD recorders sold: 55R

Total profit: 25P + 55R

Since you want the profit to be at least $225, at east $225 means $225 or more, so we use teh greater than or equal to symbols.

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.

answer: c.  

step-by-step explanation:

mixtures containing substances that get attracted to magnet can be separated using a magnet. we can separate iron from a mixture of sand and iron, as only iron attracts to the magnet.