Answer:
D
Step-by-step explanation:
using the definition of n
= ![\frac{n!}{(n-r)!}](https://tex.z-dn.net/?f=%5Cfrac%7Bn%21%7D%7B%28n-r%29%21%7D)
where n! = n(n- 1)(n - 2)......× 3 × 2 × 1
here n = 7 and r = 4, hence
7![P_{4}](https://tex.z-dn.net/?f=P_%7B4%7D)
= ![\frac{7!}{3!}](https://tex.z-dn.net/?f=%5Cfrac%7B7%21%7D%7B3%21%7D)
=
← cancel 3 × 2 × 1 leaving
7
= 7 × 6 × 5 × 4 = 840 → D
The scientific method has to do with process by which we arrive at knowledge in the realm of science.
<h3>What is the scientific method?</h3>
The scientific method has to do with process by which we arrive at knowledge in the realm of science. It involves observation, hypothesis, experiment, results and conclusion.
To carry out a research, the first thing is to as a research question as shown. This question leads to the formulation of the hypothesis which is subjected to experiment and subsequent conclusion.
Learn more about scientific method:brainly.com/question/7508826
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By what you have described, the equation you're looking for would be
y = -(2/3)x+ 6
Rearrange if necessary.
Since we are given with the three sides of the triangle and asked to determine the angle, we can use the cosine law.