Ill give brainliest to first answer (no spam, links, or random)

it is 78

Step-by-step explanation:

30

Step-by-step explanation:

Lets use the formula BEDMAS:

-6 × -3 = 18 (Since two negatives equals a postive)

18 - 8 = 10

We have a first bracket done, so lets do the next one:

-6 ÷ -2 = 3

In the middle, the is a multiply symbol, so

10 × 3 = 30

Have a good day :)

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