Does y=-4+3x^2 open upwards or downwards

Upwards

Step-by-step explanation:

The general form of a quadratic is  

We can tell whether the curve opens upward or downward by the sign of "a"

If

Reaaranging the given equation:

Here, we see that a  is positive, so the curve opens Upward

3, 12, 48, 384, 1536, 6144, 24576, 98304

step-by-step explanation:

just keep timing it by 4.

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