FM The cost of petrol is directly proportional to the amount put in the tank.
When 40 litres is used, it costs £32.00.How much:
A tank holds 60 litres when full. Petrol is put into the tank until it is full.
The petrol costs £25.
How much petrol was in the tank before it was filled up?

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

a

step-by-step explanation:

strong negative correlation

show us the triangle so we can answer it

just a girl thing, i think im cute when im not lol