Let ƒ(x) = 4x − 7 and g(x) = 5 + 9x. What are ƒ + g and ƒ − g? What are their domains?

We want to sum (and subtract) two functions and then find the domains. Remember that the domain of a function is the set of all the possible values of x that we can input in the function.

We have:

f(x) = 4x - 7

g(x) = 5 + 9x

The sum is just:

f(x) + g(x) = 4x - 7 + 5 + 9x = 13x - 2

And this is a linear function, so the domain (like in all linear functions) is the set of all real numbers.

For the difference we have:

f(x) - g(x) = (4x - 7) - (5 + 9x) = -5x - 12

Again, the domain is the set of all real numbers.

If you want to learn more, you can read:

link

Step-by-step explanation:

f(x) + g(x) = 4x - 7 + 5 + 9x = 13x - 2

f(x) - g(x) = 4x - 7 - 5 - 9x = -5x - 12

the median here is 25. your lowest value is 14 and highest value is 48. to find the third quartile, find the medium number in between 25 and 48 which would be 42 i believe.