A copy machine makes 32 copies per minute. How many copies does it make in 4 minutes and 15 seconds?

136

Step-by-step explanation:

32*4=128

15=1/4 of a minute

32/4=8

128+8=136

136 copies

Step-by-step explanation:

32 copies = 1 minute

128 copies = 4 minutes

15 seconds = 1/4 minute

15 seconds = 1/4 of 32 = 8

128+8 = 136

0.16 or 16%

step-by-step explanation:

lets take a coin for example.

if you toss it twice, it has a 1/4 chance of landing on heads both times because 1/2 * 1/2 is 1/4.

with the cards, the chance of picking dog is 0.4. having two people pick one is like picking a card twice in a row. so 0.4 * 0.4 is 0.16, or 16%

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.