Answer: 90°
Step-by-step explanation:
A measure of central tendency is a single value that attempts to describe a set of data by identifying the central position within that set of data. ... The mean (often called the average) is most likely the measure of central tendency that you are most familiar with, but there are others, such as the median and the mode.
The equation which shows the one way to determine the factors of provided equation by grouping is,

<h3>What is a factor of polynomial?</h3>
Polynomial equations is the expression in which the highest power of the unknown variable is n (n is real number).
Factor of a polynomial is the terms in linear form, which are when multiplied together, give the original polynomial equation as result.
The provided polynomial equation is,

To factorize the above polynomial equation, make the groups, by taking out the greatest common factor.

Hence, the equation which shows the one way to determine the factors of provided equation by grouping is,

Learn more about factor of polynomial here;
brainly.com/question/24380382
Answer:
12 minutes
Step-by-step explanation:
4 minutes= 7 kilometers
=> 4*3 minutes= 7*3 kilometers
=12minutes=21km