Using the weighed mean formula, it is found that Mara's average for the course was of 68.6.
<h3>What is the weighed mean?</h3>
The weighed mean is given by the <u>sum of all elements in a data-set multiplied by it's weight, divided by the sum of the weights</u>.
In this problem, the weights are as follows:
- A quiz has a weight of 1.
- A test has a weight of 2.
- The final examination has a weight of 4.
Hence, her weighed mean is given as follows:

Mara's average for the course was of 68.6.
More can be learned about the weighed mean formula at brainly.com/question/24398353
The <u>possible rational zeros</u> of <u>polynomial function</u>
could be only among the <u>divisors</u> of the <u>free term</u> of this polynomial function.
The free term is 20 and the divisors of 20 are:

Answer: correct choice is C
There are going to be two solutions because the "biggest" x is x^2 but you can factor to find what they actually are.
100-55=45%
45/100 × x = 423
x = (423)/(45/100)
x=940 peoples