21+21+9+9=
2(9+21)=
Hope this helps
Answer:

Step-by-step explanation:
we know that
An exterior angle of a triangle is equal to the sum of the opposite interior angles.
see the attached figure to better understand the problem
so
∠DEF=∠ECD+∠CDE
substitute the given values

solve for x
Combine like terms

Group terms



Find the measure of angle CDE

substitute the value of x

Last one u can use a cac lol
The correct anwser is 12. The solution is 76/6 then you know it's 12.666666666... But we can't say that's 13 because they are human. So wecan only say the number is 12 not 13.
Answer:
≈0.76
Step-by-step explanation:
P(A) = 0.33
P(A and B) = 0.25
P(B) = ?
-------------
<u>Probability of two events happening is the product of individual probabilities</u>
<u>Then to find the probability of one of the events: </u>
- P(B) = P(A and B) / P(A)
- P(B) = 0.25 / 0.33 ≈ 0.76