Since we already know that the older child is a girl (a 100% chance to be a girl), there must be a 50% chance that the other child is a girl. Therefore, the probability that both children are girls is 50%.
Hope this helps!
To divide like bases just subtract the exponents
answer is 2^(13-3) or 2^10 or 1024
Step-by-step explanation:
A = pi × r²
A = pi × 13²
A = 530.93 km²
