Answer:
(-2, 4) U [7, ∞)
Step-by-step explanation:
The domain of a function is the set of inputs at which the functions is defined. Usually determined by the x-values. In this problem we have the graph of a function. At x = -2 the function is not defined, we can see this by taking a look at the opened circle at this value in the graph. Then the function takes values until x = 4. Notice that at x = 0 the function is defined. At x = 0 to left the function takes the value y = 0 and at x = 0 to the right the function takes the value y = -1. Then the function takes value at x = 7 (including this value because of the closed circle in the graph) and beyond. Therefore, the correct answer is:
(-2, 4) U [7, ∞)
<h3>
Answer: A, B, D, J</h3>
These points are all in the vertical plane shown in the diagram. Think of the plane as a flat sheet of paper that doesn't bend.
Only points L and K are outside of this plane. So if we listed {L, D, A, J} then that list of points isn't coplanar.
Answer:
≥ 420 boards
Step-by-step explanation:
Write the required relation between cost per board and "x" (the number of boards that must be sold).
143 + 30240/x ≤ 215 . . . . . . . note that the first term is <em>not</em> 143x
Subtract 143
30240/x ≤ 72
Multiply by x/72. This is a positive number because x is a positive number.
30240/72 ≤ x
420 ≤ x
At least 420 surfboards must be sold to limit the final cost per board to $215.
Answer:
92
Step-by-step explanation:
20% of 460 is 92 so it would be 92