Answer:
A. 22°
E. 15
I. 39°
F. 71°
C. 25.6
H.12.9
K.55°
Step by Step Explanation:
1.
degrees
2. 22sin43=15
3. 
4. 
5. 20/(tan38)=25.58883264 or 25.6
6. 20sin40=12.85575219 or 12.9
7. 
Hope that helps!:)
Answer:

Step-by-step explanation:
In this problem we have the equation of the following quadratic equation and we want to solve it using the method of square completion:

The steps are shown below:
For any equation of the form: 
1. If the coefficient a is different from 1, then take a as a common factor.
In this case
. Then:

2. Take the coefficient b that accompanies the variable x. In this case the coefficient is 4. Then, divide by 2 and the result squared it.
We have:

3. Add the term obtained in the previous step on both sides of equality, remember to multiply by the common factor
:

4. Factor the resulting expression, and you will get:

Now solve the equation:
Note that the term
is always
therefore it can not be equal to -28.
The equation has no solution in real numbers.
In the same way we can find the complex roots:

Im pretty sure it would be 4^-2 because when you’re multiplying two different exponents you add them. i hope i helped!
That answer is 180. The formula is a=bh1/2
Answer:
F=140°
Step-by-step explanation:
130+120+110=360
720-360=360
40+60+20=120 360+120=480
480÷3=160 x=160
160-20=140
f=140°