Big ifs, question writers. These are of course approximations.
The "co" in cosine comes from complementary angles. It means since 


Answer: cos 48° = 2/3
Similarly,


Answer: tan 69.5° = 8/3
 
        
             
        
        
        
Using the combination formula, it is found that the number of ways to choose the presenters is given by:
C. 462.
The order in which the presents are chosen is not important, hence the <em>combination formula</em> is used to solve this question.
<h3>What is the combination formula?</h3>
 is the number of different combinations of x objects from a set of n elements, given by:

In this problem, 6 students are chosen from a set of 11, hence the number of ways is given by:

More can be learned about the combination formula at brainly.com/question/25821700
#SPJ1
 
        
             
        
        
        
Answer:
33/20
Step-by-step explanation:
1/12 - 1/15 = 5/60 - 4/60 = 1/60
d = 1/60
a_n = a_1 + d(n - 1)
a_11 = 1/15 + (1/60)(11 - 1)
a_11 = 1/15 + 1/6
a_11 = 4/60 + 10/60
a_11 = 14/60
a_11 = 7/30
a_12 = 14/60 + 1/60
a_12 = 15/60
a_12 = 1/4
s_n = n(a_1 + a_n)/2
s_11 = 11(1/15 + 7/30)/2
s_11 = 11(2/30 + 7/30)/2
s_11 = 11(9/30)/2
s_11 = 99/60
s_11 = 33/20
 
        
             
        
        
        
Answer:
B because you multiply all the similar numbers together then at the end you add them all up.Step-by-step explanation:
 
        
             
        
        
        
Current temperature = -2°C
Rise in temperature = 15°C
New temperature = (-2 + 15)°C = 13°C