Answer:

Step-by-step explanation:
We are given that
Mass of crate=m=6.5 Kg
Height,
We have to find the magnitude of F when t=4 s
Differentiate w.r.t t

Again differentiate w.r.t t


Substitue t=4


Where 
Substitute the values



I assume it's 43 <em>thousand</em> and 335, not 43 <em>point</em> 335.
The first 3 from the right is for tens, the second is 10 times stronger because it's for hundreds and the fourth is again 10 times stronger because it's for thousands. Hopefully that's what you meant :)
Subtract 9 from both sides of the '=' sign
9 - 9 + b = -8 -9
b = -17 That's the answer.
4 (2x – 3)= 2( 3x + 1)
<span>(4 (2x – 3)= 2( 3x + 1)) </span>÷ 2
2 (2x – 3) = (3x + 1)
4x - 6 = 3x +1
-3x -3x
__________
x - 6 = 1
+6 +6
______
x = 7