6i^4 = 6*1 = 6
6i^3 = 6*(-i) = -6i
-2i^2 = (-2)*(-1) = 2
sqrt(-49) = 7i
So, we have: 6 - 6i + 2 + 7i = 8 + i
The answer is D
Which digit is underlined lol
Well we know that A+B+C=180
and we know that A=45 and B=90
so together there 135
180-135=45
so C=45
now we also know that a straight line is 180 degrees so 180-45 =135(angle f)
135+15(angle e)=150
180-150=30
so angle d=30
Answer:
Proved that DF = FE.
Step-by-step explanation:
See the given diagram attached.
In triangle Δ DEF, we have to prove DF = FE when ∠ 3 = ∠ 4.
The proof is like followings :
1. ∠3 = ∠4, Reason: Given
2. ∠1 and ∠3. Reason: They are supplementary.
∠2 and ∠4. Reason: They are supplementary.
3. ∠1 = ∠2. Reasons: Two Angles Supplementary to Equal Angles are Equal to Each Other.
4. DF = EF. Reason: Opposite sides of equal angles. (Answer)
