Answer:

Step-by-step explanation:
, substitute
to x
=
or 3.75
=
= 
A negative times a negative is a positive so...
( - ) ( - ) ( - ) ( -10x ) = -5
10x = -5
x = -5/10
x = -1/2
Only selections B and D give a maximum height of 13 at t=3. However, both of those functions have the height be -5 at t=0, meaning the ball was served from 5 ft below ground. This does not seem like an appropriate model.
We suspect ...
• the "correct" answers are probably B and D
• whoever wrote the problem wasn't paying attention.
Answer:
E
E is the only one that ends with 70 and is also all multiples of 6.
Answer:

Step-by-step explanation:
m = Masa del bloque = 18 kg
F = Fuerza en el bloque = 300 N
= Coeficiente de fricción = 0.6
El equilibrio de fuerzas del sistema viene dado por

La aceleración del bloque es
.