an oil companys
fills 1\10 of a tank in 1\5 hour. at this rate, which expression can be used to determine how long it will take for the tank to fill completely?

2 h

Step-by-step explanation:

1/10=0.1

1/5=0.2

Use proportion:

0.1:0.2=1:x

x*0.1=0.2

x=0.2/0.1

x=2

x = ±sqrt(10)

step-by-step explanation:

5 - 2x² = -15

subtract 5 from each side

5-5 - 2x² = -15-5

-2x^2   = -20

divide by -2 on each side

-2x^2   /-2= -20/-2

x^2 =10

take the square root on each side

sqrt(x^2 )=±sqrt(10)

x = ±sqrt(10)

check:

5 - 2x² = -15

+sqrt(10)

5 - 2(sqrt(10))² = -15

5 -2(10) = -15

5 -20 = -15

-15 = -15

-sqrt(10)

5 - 2(-sqrt(10))² = -15

5 -2(10) = -15

5 -20 = -15

-15 = -15

answer: 1475

step-by-step explanation:

becuase you have to know what they are asking you