If y = cos(kt), then its first two derivatives are
y' = -k sin(kt)
y'' = -k² cos(kt)
Substituting y and y'' into 49y'' = -16y gives
-49k² cos(kt) = -15 cos(kt)
⇒ 49k² = 15
⇒ k² = 15/49
⇒ k = ±√15/7
Note that both values of k give the same solution y = cos(√15/7 t) since cosine is even.
Answer:
Step-by-step explanation:
u put the gs with each other by flipping the one that was changed
3.6g-1.6g=8-2
2g=6
g=6/2
g=3
Answer:
can i see an image?
Step-by-step explanation:
my bad for finnesing you and thinking there's an answer
![[Hello,BrainlyUser!\; I'm\;Lenvy]](https://tex.z-dn.net/?f=%5BHello%2CBrainlyUser%21%5C%3B%20I%27m%5C%3BLenvy%5D)

Answer:
42 feet
Step-by-step explanation:
First let know what is
Yards to Feet
Note that;
1 Yard ⇒ 3 Feet
Thus, Formula: Multiply the length value by 3
Given:
Lena bought 14 yards of ribbon. How many feet of ribbon did she buy?
Therefore, 14 * 3 = 42
Hence, Answer is Lena brough 42 feet of ribbon.
~[CloudBreeze]~
Number 1 is B and number 2 I belive is C. I hope I'm rightt, and I hope this helps.