Use the fraction addition formula.

Substitute the numbers into the formula.
a=5, b=1, c=1, d=7
Answer:
B
Step-by-step explanation:
The answer is B because domain is from left to right (x-axis) and the graph seems to go on for infinity in both directions
Middle school math! I actually know how to teach differential calculus to middle schoolers, but I wouldn't start with this example, where we're gonna have to integrate eventually.
We have

We have an odd mix of s and t on the right, which means this probably was an implicit derivative to begin with. In other words, instead of s as a function of t, we have some equation of s and t that is satisfied.
We move the variables to their respective sides

Integrating,

We only need one constant of integration.
I won't bother to write the square root. This is choice D.