The square root of -48 is 2 because 2x2x2x2x2x2x is not -48
Answer:
1. i Sampling bias and
ii. Question order bias
2. Non response Bias
3.i. sampling bias
ii.question order bias
4. i. response bias
ii.sampling bias
Step-by-step explanation:
we have basically four types of bias in a research which are;
1. Sampling bias
2. Response bias
3. Non response bias
4. Question order bias
Answer:

Step-by-step explanation:
Required
The equation of the ellipse
This is calculated as:

Where:
---- height
--- width
So:



Answer:

Step-by-step explanation:
Do FOIL, first outside inside last
3x × 3x = 9x^2
3x × -7 = -21x
7 × 3x = 21x
7 × -7 = -49

So it would just be 9x^2 - 49