Answer:
It returns the angle whose cosine is a given number.
Step-by-step explanation:
For every trigonometry function, there is an inverse function that works in reverse. These inverse functions have the same name but with 'arc' in front. (On some calculators the arccos button may be labeled arccos, or sometimes cos-1.) So the inverse of cos is arccos etc. When we see "arccos x", we understand it as "the angle whose cosine is x"
cos30 = 0.866 Means: The cosine of 30 degrees is 0.866
arccos 0.866 = 30 Means: The angle whose cosine is 0.866 is 30 degrees.
Use arccos when you know the cosine of an angle and want to know the actual angle.
The numbers 7 and 14, 28 and 7 have the greatest common factor. The correct options are A and B.
<h3>What is the greatest common factor?</h3>
The largest factor of the two numbers which divides both the numbers is called as greatest common factor or GCF. In other words, the greatest common factor is the largest positive number which can be divided into given numbers evenly.
Given the number is 7 the pair of numbers having the greatest common factor is calculated below:-
For pairs 7 and 14. Both the numbers are the multiple of 7 it can be divided by 7. The greatest common factor will be 7 for pairs 7 and 14.
Similarly for pairs 7 and 28. Both the numbers are the multiple of 7 it can be divided by 7. The greatest common factor will be 7 for pairs 7 and 28.
Therefore, the numbers 7 and 14, 28 and 7 have the greatest common factor. The correct options are A and B.
To know more about the greatest common factor follow
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After 3 hours.
working;
after 3 hours, Terry will have completed 15 hours + 10*3 hours=45 tasks
Susan will have completed 9+ 12*3hours= 45 tasks
The answer is 24 this needs to be longer so it will send
1)-3=z+4
z=-4-3=-7
answer is C
2)z-4=-8
z=-8+4=-4
answer is C
3)6.4=4x
4x=6.4/4
x=1.6
answer is B
4)-9=r/4
r=-9×4=-36
answer is D
5)-9=3/8n
n=-9×3/8
n=-24
answer is A, I guess, because there are two = signs, so perhaps this is a mistake and there should be - instead of =