Answer:
D
Step-by-step explanation:
cosΘ =
= 
Answer:

Step-by-step explanation:


Answer:
16
Step-by-step explanation:
To solve, we can use an equation finding the average of the siblings'ages.

Answer:
24, 14
Step-by-step explanation:
x + y = 38
x = 10 + y
You can substitute (10+y) into the top equation where the x is.
10 + y + y = 38
10 + 2y = 38
2y = 28
y = 14
Now plug 14 in for y in either equation to get x
x = 10 + 14
x = 24