What is the domain of the function f(x) = x2 + 3x + 5
2 answers:
Answer:
The domain is all real numbers
Step-by-step explanation:
we have
This is the equation of a vertical parabola open upward
The vertex is a minimum
Using a graphing tool
see the attached figure
The vertex is the point
The range is the interval-------> [2.75.∞)
-------> All real numbers greater than or equal to
The domain is the interval -------> (-∞,∞) -----> All real numbers
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Answer:
The energy used in 3.5 hours = 5.25 kilowatts
Step-by-step explanation:
Energy used by electric kettle:
kilowatts
Time taken by electric kettle:
- 1.5 hours
Electric kettle's rate in kilowatts per hour can be calculated by dividing the spent energy i.e. 2.25 kilowatts by the time taken i.e. 1.5 hours.
Therefore,
Electric kettle's rate = 2.25 kilowatts / 1.5 hour
= 1.5 kilowatts per hour
Thus, the energy used in 3.5 hours = 1.5 × 3.5
= 5.25 kilowatts
Therefore, the energy used in 3.5 hours = 5.25 kilowatts