It CAN'T equal 21, since 9+10=19
BUT, if the 9 was changed to like, 11 - Then it would = 21, or if the 10 was changed to a 12, it would make 21 also,
Answer:
48° or 138°
Step-by-step explanation:
![Complementary \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: Supplementary](https://tex.z-dn.net/?f=%20%3Cu%3EComplementary%3C%2Fu%3E%20%5C%3A%20%5C%3A%20%5C%3A%20%5C%3A%20%5C%3A%20%5C%3A%20%5C%3A%20%5C%3A%20%5C%3A%20%5C%3A%20%5C%3A%20%5C%3A%20%5C%3A%20%5C%3A%20%5C%3A%20%5C%3A%20%5C%3A%20%5C%3A%20%5C%3A%20%5C%3A%20%5C%3A%20%5C%3A%20%5C%3A%20%5C%3A%20%5C%3A%20%5C%3A%20%5C%3A%20%5C%3A%20%3Cu%3ESupplementary%3C%2Fu%3E%20)
![90° = 42° + m∠4 \: \: \: \: \: 180°= 42° + m∠4](https://tex.z-dn.net/?f=90%C2%B0%20%3D%2042%C2%B0%20%2B%20m%E2%88%A04%20%5C%3A%20%5C%3A%20%5C%3A%20%5C%3A%20%5C%3A%20180%C2%B0%3D%2042%C2%B0%20%2B%20m%E2%88%A04)
![48°= m∠4 \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: 138° = m∠4](https://tex.z-dn.net/?f=48%C2%B0%3D%20m%E2%88%A04%20%5C%3A%20%5C%3A%20%5C%3A%20%5C%3A%20%5C%3A%20%5C%3A%20%5C%3A%20%5C%3A%20%5C%3A%20%5C%3A%20%5C%3A%20%5C%3A%20%5C%3A%20%5C%3A%20%5C%3A%20%5C%3A%20%5C%3A%20138%C2%B0%20%3D%20m%E2%88%A04)
I am joyous to assist you anytime.
Answer:
trapeziod
Step-by-step explanation:
A trapezoid is a quadrilateral with only one pair of opposite sides parallel. The parallel sides are called bases, and the nonparallel sides are called legs. A segment that joins the midpoints of the legs is called the median of the trapezoid
<h3>
Answer: 8</h3>
Work Shown:
y = 2x^3 - 4x
dy/dt = 2*3*x^2*dx/dt - 4*dx/dt
dy/dt = 2*3*1^2*4 - 4*4
dy/dt = 8
notice how I used the chain rule for step 2.