a stretch by 3 and a rotation
The associative property of addition says
(a+b)+c=a+(b+c)
so the answer is x+(2+3) or also x+5
The answer is 2 because you multiply them both
For a better understanding of the explanation provided here kindly go through the file attached.
Since, the weight attached is already at the lowest point at time, t=0, therefore, the equation will have a -9 as it's "amplitude" and it will be a Cosine function. This is because in cosine function, the function has the value of the amplitude at t=0.
Now, we know that the total angle in radians covered by a cosine in a given period is
and the period given in the question is t=3 seconds. Therefore, the angular velocity,
of the mentioned system will be:

Combining all the above information, we see that the equation which models the distance, d, of the weight from its equilibrium after t seconds will be:

Thus, Option B is the correct option. The attached diagram is the graph of the option B and we can see clearly that at t=3, the weight indeed returns to it's original position.
The answer is 10.8 because the sides are 1.7*2/2=1.7 1.7*4
6.8+ 2*8=14.8. so 14.8 is the answer