Step-by-step explanation:
270°/360° ×π×13²cm
=398.20cm²
Both traveled the same speed: 3cm/3s= 1m/s and 6cm/6s= 1m/s
The ratio is 12:28. Or in fraction form it’s 12/28. You can also simplify it to 3/7
X=-1 is the answer. Hope that helps!
The general formula for exponential growth and decays is:

if k>0 then then it is an exponential growth function. If k<0 then the function represents an exponential decay.
Now we need to classify each of the functions:
1.
The function

can be wrtten as:

comparing with the general formula we notice that k=2, therefore this is an exponential growth.
2.
The function

can be written as:

comparing with the general formula we notice that k=-4, therefore this is an exponential decay.
3.
The function

comparing with the general formula we notice that k=-1, therefore this is an exponential decay.