Answer:
- domain: [0, ∞)
- range: (-∞, ∞)
- not a function
Step-by-step explanation:
The arrows indicate the graph continues indefinitely in the direction indicated.
The domain is the horizontal extent, so is the interval from 0 to infinity, including 0.
The range is the vertical extent, so extends from negative infinity to positive infinity (all real numbers).
The graph does not pass the vertical line test: a vertical line intersects it in more than one place, so the relation is NOT a function.
Answer:
x = 4 and y = - 5
Step-by-step explanation:
note that the product of a complex number and it's conjugate is real
That is
(a + bi)(a - bi) where a, b are real
= a² - abi + abi - b²i²
= a² + b² ← a real number
For (4 + 5i)(x + yi) to be real
we require (x + yi) to be the conjugate of 4 + 5i , that is 4 - 5i
(4 + 5i)(4 - 5i) ⇒ x = 4 and y = - 5
(17*3) --- to find the total points of the 3 quizzes
17*3=51
the third quiz grade=51-14-19=18
hope this helps
