La Mamá de la mamá de la mamá de la mamá de la mamá
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:
number 3
Step-by-step explanation:
(3,000+900+70) = 3,970
3,970*10 = 39,700
That'd be 32 with no remainder.
