Answer:
distance covered in 2 hours = 80 km
distance covered in 1 hour = 80÷2 = 40 km
distance covered in 7/2 hours = 40 × 7/2
= 140 km
(3 1/2hours = 7/2 hours)
The sum of angles for any triangle is 180°. So x=180-19-(180-51)=32°
Answer:

Step-by-step explanation:
The formula of a volume of a cylinder:

r - radius
H - height
We have

Substitute:
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4 dollars and 5 cents ($4.05) :)))