Exercise regularly.
Do not smoke or use tobacco products.
Get plenty of rest.
Eat a balanced diet.
Step-by-step explanation:

F(x)=5-3x³
f'(x)=-9x²
f'(3)=-81
y+76= -81(x-3)
y+76=-81x+243
y=-81x+167
Median is the middle number and you have to put each set in order like you've done, tick each number off and each side working in:
3,4,-6-,7,8 =6
3,3,-4-,5,5 =4
6,7,-7-,8,9 =7
2,2,-3-,4,6 =3
Mode is the number that shows up the most
3,4,6,7,8= no mode
3,3,4,5,5= 3 and 5
6,7,7,8,9=7
2,2,3,4,6=2
6,7,7,8,9 both have 7 for mode and median