The solution to the question is:
c is 6 =
b is 5 =
cosB is 2 =
a is 4 =
cosA is 3 =
cosC is 1 =
<h3>What is cosine rule?</h3>
it is used to relate the three sides of a triangle with the angle facing one of its sides.
The square of the side facing the included angle is equal to the some of the squares of the other sides and the product of twice the other two sides and the cosine of the included angle.
Analysis:
If c is the side facing the included angle C, then
= + -2ab cos C-----------------1
then c =
if b is the side facing the included angle B, then
= + -2accosB-----------------2
b =
from equation 2, make cosB the subject of equation
2ac cosB = + -
cosB =
if a is the side facing the included angle A, then
= + -2bccosA--------------------3
a =
from equation 3, making cosA subject of the equation
2bcosA = + -
cosA =
from equation 1, making cos C the subject
2abcosC = + -
cos C =
In conclusion,
c is 6 =
b is 5 =
cosB is 2 =
a is 4 =
cosA is 3 =
cosC is 1 =
Learn more about cosine rule: brainly.com/question/4372174
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Answer:
First sencente is the correct one
Step-by-step explanation:
First we can find the total books and the average book per day for each grade:
7th grade: total of 6 + 6 + 7 + 11 + 5 = 35 books
average: 35 / 5 = 7 books per day
8th grade: total of 4 + 5 + 10 + 10 + 16 = 45 books
average: 45 / 5 = 9 books per day
First sencente: true, 8th grade has 9 books per day and 7th grade has 7 books per day
Second sentence: false, 8th grade has 45 books and 7th grade has 35 books
Third sentence: false, it is 6.
Fourth sentence: false, range for 7th grade is 5, range for 8th grade is 12
Hi There!
Since 3 teachers share 2 packs of paper equally, you have to divide 3/2, once you divide you should get the answer of 1.5, To check you're answer do 1.5*2 which equals to three. So, each teacher gets 1.5 packs of paper.
Hope This Helps :)
The final correct answer
(2.2, -1.35) and (2.2, -1.4)
Your welcome!
Also, could I be marked brainliest?
They could be: 12:14, 18:21, 24:28