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ZanzabumX [31]
3 years ago
5

How do you use the law of cosines or law of sines if you are given a=13 m, b=8.5 m, and c=9 m?

Mathematics
1 answer:
Rus_ich [418]3 years ago
3 0
The law of cosines is 
c= square root of a^2 + b^2 - 2ab cos c

the law of sines is
a = b(sin a /sin b)
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B is the midpoint of AC and E' is the midpoint of BD. If A(-9,-4), C(-1, 6), and E(-4,-3), find the coordinates of D.
Ipatiy [6.2K]
The coordinates for D are (-4, -7)

First we must locate point B as it is vital to finding the midpoint of BD. To do this, we take the average of the endpoints AC since B is its midpoint. 

x values = -9 + 1 = -8
Then divide by 2 for the average -8/2 = -4

y values = -4 + 6 = 2
Then divide by 2 for the average 2/2 = 1

Therefore B must be (-4, 1)

Now we know the values of E must be the average of B and D. So we can write equations for each coordinate since we know they are averages. 

x - values = (Bx + Dx)/2 = Ex
(-4 + Dx)/2 = -4 ---> multiply both sides by 2
-4 + Dx = -8 ---> add -4 to both sides
Dx = -4

y - values = (By + Dy)/2 = Ey
(1 + Dy)/2 = -3 ---> multiply both sides by 2
1 + Dy = -6 ---> subtract 1 from both side
Dy = -7

So the coordinates for D must be (-4, -7)
5 0
3 years ago
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Which number goes in the box to make a true equation?<br> ]X 10 = 42.000
kherson [118]

Answer:

x=4200

Step-by-step explanation:

10x=42000

x=4200

5 0
2 years ago
Is this statement true or false explain why 6,203 &gt; 6,320
harina [27]

Answer:

false

Step-by-step explanation:

3 0
3 years ago
What is the answer to x HURRY PLZ WHO EVER SHOWS WORK WILL GET THE BRAIINLIEST ANSWER AWARD
lakkis [162]
117 divided by g is 19.5
 
I hope this helps.
8 0
2 years ago
PLEASE HELP REALLY QUICK
nadezda [96]

Answer:

D $45

Step-by-step explanation:

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