Answer:
Step-by-step explanation:
-3x<-20-5
-3x<-25
x>25/3
Answer:
x = 11.7
Step-by-step explanation:
We have the following equation: -4.5(x-8.9)=12.6
First we divide both parts of the equation by -4.5
Then: (-4.5(x-8.9))/-4.5 = 12.6/-4.5
We get: (x-8.9) = 2.8
Then, solving for x:
(x-8.9) = 2.8 -> x = 2.8 + 8.9 = 11.7
The solution is: x = 11.7
There are 22 total fish in the tank because 8 got doubled so 11 would also have to get doubled
Answer:
The minimum average speed needed in the second half is 270 km/hr
Step-by-step explanation
We can divide the track in two parts. For the first half of the track the average speed the car achieved was 230 km/hr and we need to make sure that the average speed of the full track is 250 km/hr. Then, we can calculate the average speed of the two parts of the track and force this to be equal to 250 km/hr. In equation, defining
as the average speed of the second half:

Solving for 

Therefore, achieving a speed of 270 km/hr in the second half would be enough to achieve an average speed of 250 on the track.