Devaughn is 10 years younger than Sydney. The sum of their ages is 74. What is Sydney's age? yearsold

Step-by-step explanation:

x = devaughn age

y = sydney age

x = y - 9

x + y = 61

y-9 + y = 61

2y= 61+9

2y = 70

y = 35

x = 35 - 9 = 26

check

35 + 26 = 61

35- 26 = 9

Hope this helps!

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