Answer:
A. Kayla
Step-by-step explanation:
To find the difference between the two numbers we will do:
7°C - (-5°C)
Subtracting a negative number is the same as simply adding, so we can rewrite the equation as:
7°C + 5°C = 12°C
It can be viewed different to what is more accurate depending on the relation of this question to another.
The answer will most likely be 56 degrees try that it should be the answer!
Answer:
(D) ![b^2=151](https://tex.z-dn.net/?f=b%5E2%3D151)
Step-by-step explanation:
Given: In triangle ABC, a=9, c=5 and ∠B=120°.
To find: The value of
.
solution: It is given that In triangle ABC, a=9, c=5 and ∠B=120°.
Now, using the law of cosines, we get
![b^2=a^2+c^2-2(a)(c)cosB](https://tex.z-dn.net/?f=b%5E2%3Da%5E2%2Bc%5E2-2%28a%29%28c%29cosB)
Substituting the given values, we get
![b^2=9^2+5^2-2(9)(5)cosB](https://tex.z-dn.net/?f=b%5E2%3D9%5E2%2B5%5E2-2%289%29%285%29cosB)
![b^2=81+25-90(\frac{-1}{2})](https://tex.z-dn.net/?f=b%5E2%3D81%2B25-90%28%5Cfrac%7B-1%7D%7B2%7D%29)
![b^2=81+25+45](https://tex.z-dn.net/?f=b%5E2%3D81%2B25%2B45)
![b^2=151](https://tex.z-dn.net/?f=b%5E2%3D151)
which is the required value of
.
Therefore, option D is correct.