The distance to the nearest gas station is 2 4/5 kilometers. what is this distance
written as a decimal

answer:

x=-4                       x=-2

step-by-step explanation:

x^2+6x+8=0

what 2 numbers multiply to give us 8 and add to give us 6

4*2 = 8 4+2 =6

(x+4)   (x+2) =0

using the zero product property

x+4 =0   and x+2 =0

x+4-4 = 0-4       x+2-2 = 0-2

x=-4                       x=-2

answer: 10 minutes

step-by-step explanation:

1. jonathan can type 20 documents in 40 minutes (20/40=1/2 per minute), susan can type it in 30 minutes (20/30=2/3 per minute) and jack can type it in 24 minutes (20/24=5/6 per minute), then you must add them to obtain the number of pages they wan write   in 1 minute working together:

2. then, the time will it take them type the same document of 20 pages is:

answer:

step-by-step explanation:

note :

( a + b )^3 = a^3 +b^3 +3 a²b +3b²a + *)

the condition is : r = 1   and   p=1

put : x= a   and   b = 1   in (*) you have :

(x + 1)^3 = x^3 +3x² +3x +1

the zeros is : x = - 1

bcause : x^3 +3x² +3x +1 = 0     (x + 1)^3 = 0   so : x = - 1