Answer:
C.
Step-by-step explanation:
use the pythogorean theorem a^2 + b^2 = c^2
Answer:
D. 100 cm^2
Step-by-step explanation:
i did this before so ik im right
5-2x=7-5x
-2x+5x=7-5
3x=2
X=2/3
Answer:
Not a subspace
Step-by-step explanation:
(4,0,0) and (0,4,0) are vectors in R3 with zero or one entries being nonzero, but their sum, (4,4,0) has two nonzero entries.