PLSSS HELP IF YOU TURLY KNOW THISS

x=-4

Step-by-step explanation:

x=4

Step-by-step explanation:

distribute the 9 into the 5-x so that becomes 45-9x= 81

then subtract 45 from both sides so that becomes -9x=36

after that divide both sides by 9 so it becomes x= -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

i found two solutions,   n = 2 • ± √3 = ± 3.4641

step-by-step explanation: