Answer:
Step-by-step explanation:
John's age = w
His brother's age = 2*w = 2w
His sister's age = 16 years
Total age of all siblings = 31
w + 16 + 2w = 31
w + 2w + 16 = 31
Combine like terms
3w + 16 = 31
Subtract 16 from both sides
3w = 31 - 16
3w = 15
w = 15/3
w = 5

His brother's age = 2w
= 2*5
= 10

Answer: D: (4 x 87) x (1/10 x 1/10)
Graph A. We have a *positive* slope, so the boundary line will be rising as its x values increase, and our inequality is telling us we’re looking at all values of y less than, or *below* that boundary line. Graph A meets both these requirements.