Yes you are right it's C) Notice that f(-2) = (-2)³ +2( - 2)² + 4(-2) + 8 =0 Then x³+2x²+4x+8 is divisible by (x+2) Perform this division & you will get:
x³+2x²+4x+8 = (x+2)(x²+4) The root of (x+2) is the value that render it nil, that is x=-2 The root of (x²+4) are imaginary (not real) because x²+4 =0 ==> x² = -4 & x=√-4 or x= 2i (nor real). Hope you understood the reasoning
Option d (convenience sample) is the right solution.
Step-by-step explanation:
An unlikely sample wherein the investigator chooses such individuals closest and therefore most approachable for the particular investigation, would be termed as a Convenience sample.
It's a way to gather information or data with the use of sampling advantageously positioned around a place or broadband internet.
All other alternatives aren't related to the given scenario. So the above option is correct.
For this case, the first thing we must do is define variables. We have then: x: number of minutes y: final temperature We write then the equation that models the problem: For y = 20 we have: Clearing x: Answer: The temperature of the water will be 20 degree celcius after 150 minutes