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alukav5142 [94]
3 years ago
7

Use a half-angle idenitity to find the exact value of tan 5pi/12

Mathematics
1 answer:
tatyana61 [14]3 years ago
3 0
Hello here is a solution :

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Can anyone help me? My teacher just recently taught me this today, be he never explained much. The question is in the photo
IceJOKER [234]

You've got five different problems in this photo ... four on top and the word problem on the bottom ... and they're all exactly the same thing:  Taking two points and finding the slope of the line that goes through them.

In every case, the procedure is the same.
If the two points are  (x₁ , y₁)  and  (x₂ , y₂) , then
the slope of the line that goes through them is

                          Slope  =  (y₂ - y₁) / (x₂ - x₁) .

This is important, and you should memorize it.

#1).  (8, 10)  and  (-7, 14)

         Slope  =  (14 - 10) / (-7 - 8)  =  4 / -15

#2).  (-3, 1)  and  (-17, 2)

         Slope  =  (2 - 1) / (-17 -  -3)  =  (2 - 1) / (-17 + 3)  =  1 / -14

#3).  (-20, -4)  and  (-12, -10)

         Slope  =  [ -10 - (-4) ] / [ -12 - (-20) ]

=========================================

The word problem:

This question only gives you one point on the graph,
and then it wants to know what's the slope ?
What are you going to do for another point ?

A "proportional relationship" always passes through the origin,
so another point on the line is  (0, 0) .

Now you have two points on THAT line too, and you can easily
find its slope.

4 0
3 years ago
on Monday Steven read 9 pages of his new book to finish the first chapter on Tuesday he needs to read double the number of pages
GarryVolchara [31]
Answer=18 pages

Steven read 9 pages on Monday. If he needs to read DOUBLE that amount on Tuesday, then we need to take the number of pages he read on Monday and times it by 2.

9*2=18pages

Steven needs to read 18 pages on Tuesday.

**Remember that Double is the same as 'two times more', or 2x more...
3 0
3 years ago
Read 2 more answers
Please answer for me!
vekshin1
Part b is $638.40
Part c is $1,641.6
8 0
2 years ago
Rebbeca's recipe calls for 4/5 of a cup of flour. She plans to make 1/4 of the recipe. How much flour will she use?
sukhopar [10]
1/4 of 4/5
=16/20 divided by 5/20
=16/20*20/5
=320/100
=3.2 or 3 1/5
3 0
3 years ago
Read 2 more answers
A sample of restaurants in a city shows that the average cost of an appetizer is $6.32 with a standard deviation of
iren2701 [21]
The answer would be b
6 0
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