We can use two different methods to find our missing angle:
Subtract the two known angles from 180° :
Plug the two angles into the formula and use algebra: a + b + c = 180°
Answer: 7
Step-by-step explanation:
Answer:
Neither.
Step-by-step explanation:
13 - 1 = 12 and 19 - 13 = 6 - no common difference so its not Arithmetic.
13/1 = 13 and 19/13 = 1.46 - no common ratio so its not Geometric.
Answer:
9x^4 -36
Step-by-step explanation:
see image below:)
x = 1 because -7(3x + 4) must be -49 so 3x + 4 must me 7 so x = 1