Answer:
A. 2.3 sec and 5 sec
Step-by-step explanation:
We are given that start from 110 feet away, a person on a bicycle rides towards a checkpoint and then it passes it. the rider is traveling at a constant rate of 30 feet per second.
The distance between the bicycle and the checkpoint is given by the equation :

Now we are required to calculate at what times is the bike 40 feet away from the checkpoint. So, substitute d = 40 in the equation

and 
and 
and 
and 
and 
Hence at 2.3 sec and 5 sec the bike is 40 feet away from the checkpoint.
Answer:
the answer is
t + u = 9
10t + u = 10u + t – 9
Step-by-step explanation:
Answer:
<h2>r = 8</h2>
Step-by-step explanation:
The standard form of an equation of a circle:

(h, k) - center
r - radius
We have the equation:

Therefore the center is (0, 0) and the radius r = 8
Answer:
The Answer is 0.04
Step-by-step explanation:
First 1/5 is equivalent to 20% so to get 20% of both of them multiply by .2. so 400×.2=80 and 90×.2=18