Answer:
there is 21 boys
Step-by-step explanation:
hope that helps
Answer: 
Step-by-step explanation:
Given
Speed of boat 
X-9=12
x-9+9=12+9
You need to add 9 to each side of the equation.
x=21
For a logarithmic function, we have a restriction on the domain.
Since log(0) isn't defined, we say that there is an asymptote at x = 0.
Thus, for the regular logarithmic function y = log(x), x > 0.
We can then say (x + 4) > 0, since that's when the function of a logarithm is defined as.
x + 4 > 0
x > -4
Thus, the domain of the logarithmic function is x > -4, where x is a real integer.
