Answer:
40°
Step-by-step explanation:
Measure of Nonagon (9-sided polygon) = 1260°
Each angle measure = 1260 ÷ 9 = 140°
The value of x (the outside angle) = 180° - 140° = 40°
Answer:
4.44
Step-by-step explanation:
I used a calculater to divide $17.76 by 4

We know that y=7x, so we just need tu put it into the 1st equation

So we found x. Now we can find y

Answer:
x=1, y=7; or (1;7)
Answer:
Time it will take t = 23.1 (round to the nearest tenth)
Step-by-step explanation:
Given: A population of bacteria is growing exponentially;
According to the model;
......[1]; where P is the number of colonies and t be the time measured in hours.
After how many hours will 400 colonies be present.
Substitute value of P = 400 in [1];

Divide both sides by 100 we get;

Taking ln both sides we get;

Since; 
then;

Divide both sides by 0.06 we get;

or
hours
Therefore, the time it will take is, t = 23.1 (round to the nearest tenth)