A tank full of water is leaking at a constant rate for 30 minutes. The equation y=-9x+ 500
gives the amount of water in the tank, where yis the number of liters and x is
the number of minutes since the tank began to leak. Which statement is true?

Any one?

 A. There were 500 liters in the tank when the leak started, and it is  decreasing by 9 liters per minute.

Step-by-step explanation:

This equation is in the form; y =mx + c.

c in this equation is the value of y when x is at 0.

c in the above formula is 500 which means that the number of litres (y) at zero minutes(x) is 500 litres.

m is the rate of change as a result of a change in x.

m in this equation is -9 which means that the water is reducing by 9 litres every minute (x).

56.6

step-by-step explanation:

the ratio of the perimeters is equal to the scale.

the ratio of the areas is equal to the square of the scale.

34 / 20 = k

a / 19.6 = k²

substituting:

a / 19.6 = (34 / 20)²

a = 19.6 (34 / 20)²

a ≈ 56.6