Mathematics: Find the value of x then classify the triangle by its angles

Find the value of x then classify the triangle

emj617

13.02.2022

x = 134°

Step-by-step explanation:

Let

$\angle A=64^{\circ}\\\\\angle B =70^{\circ}$

We need to find the value of x.

We can see from the figure that x is exterior angle. To find x we can use exterior angle theorem. According to this theorem,

$x=\angle A+\angle B\\\\x=64+70\\\\x=134^{\circ}$

Hence, the value of x is 134°

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janreyes39

23.07.2022

10.8109 amu

Step-by-step explanation:

The average atomic mass of boron is determined as the average of the atomic masses of both isotopes weighed by their respective abundances.

Therefore, the average atomic mass is given by:

$M=10.0129*0.1991+11.0093*0.8009\\M=10.8109\ amu$

The average atomic mass of boron isotopes is 10.8109 amu.

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