Answer:
Domain: [-7, ∞)
General Formulas and Concepts:
<u>Algebra I</u>
- Domain is the set of x-values that can be inputted into function f(x)
Step-by-step explanation:
<u>Step 1: Define function</u>
g(x) = √(x + 7)
<u>Step 2: Determine</u>
We know that we cannot have a negative under the square root as it will produce imaginary numbers. Therefore, on a real number scale, the square root can be no less than or equal to 0.
We see from the function that in order to get 0 under the square root, x = -7. If we have x = -8, we would get -1 under the square root, thus giving us an imaginary numbers.
Therefore, our domain is x ≥ -7 or [-7, ∞).
1. Y= x+2
2. Y=Y
3. E^2 Al^3 ^2 anumbs
X- speed of the ship in still water
a- speed of current
(x+a)- speed with current
(x-a) - speed against current
(x+a)*3=72
(x-a)*4=72
x+a=24
<u>+ x-a=18
</u> 2x =42
x = 21
x+a=24, 21+a=24, a=3
The speed of the ship in still water = 21 km/h,
the speed of the current =3 km/h.
