It seems like you are presenting several mathematical problems. Let's take a closer look at each one and provide solutions step by step.
Problem 1
You have a mathematical expression: ( 3a - 0.8 ).
Given ( a = 0.5 ) and ( a = 2 ), we will calculate:
When ( a = 0.5 ):
[
3(0.5) - 0.8 = 1.5 - 0.8 = 0.7
]
When ( a = 2 ):
[
3(2) - 0.8 = 6 - 0.8 = 5.2
]
Problem 2
You need to find the average speed (OyKBeHHOe BbIpaxeHHe) of a journey with the distance of 11.3 km and time of 4 hours.
Average speed is calculated as:
[
\text{Average speed} = \frac{\text{Distance}}{\text{Time}}
]
For your case:
[
\text{Average speed} = \frac{11.3 \text{ km}}{4 \text{ hours}} = 2.825 \text{ km/h}
]
Problem 3
You need to solve the following equations:
( x = 22 )
( 5 - y = 4 )
- Rearrange: ( y = 5 - 4 = 1 )
( 8.5 : x = 0.1 )
- This means ( \frac{8.5}{x} = 0.1 )
- Rearrange:
[
8.5 = 0.1x \implies x = \frac{8.5}{0.1} = 85
]
Problem 4
You have the expression ( 4.5a - 5b ) with ( a = 5, b = 1.5 ):
[
4.5(5) - 5(1.5) = 22.5 - 7.5 = 15
]
Problem 5
This problem might be related to a percentage calculation based on ratios. You mentioned a tax rate of 40% and a rate of 60%.
Assuming you want to calculate the total "effective" tax closure, you could do this in the context of a more extensive scenario. However, the specific relationship between the two percentages and the question's structure isn't clear. More context is needed for the exact calculation.
Problem 6
You have the expression ( 178.87 - (b - 13.4) = 174.77 ):
To solve for ( b ):
- Rearrange the equation:
[
178.87 - 174.77 = b - 13.4
]
[
4.1 = b - 13.4
]
- Solve for ( b ):
[
b = 4.1 + 13.4 = 17.5
]
If you have more details or specific contexts for Problem 5 or need any additional clarifications, please let me know!
