First we need to calculate how many years her brother has when she is 18. As text says he is:
18/3 = 6 years old
Now when she gains another 18 years (36-18=18) he will also gain those 18 years
When she is 36 he will have 6+18=24 years old
Answer is 24.
Answer:
C
Step-by-step explanation:
Cool
The equation of ellipse:

The formula of c (the distance to the foci)

<h3>Answer: c² + b² = a²</h3>
<span>yes; the number is written in scientific notation</span>
1) Take the perimeter and divide it by 4.
2) Take the answer from step 1 and square it (multiply by itself)