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Harrizon [31]
3 years ago
7

Please help fast for question A and B I’d appreciate it

Mathematics
1 answer:
SSSSS [86.1K]3 years ago
6 0

Step-by-step explanation:

a) Since the precision of the ruler is 1 mm, the uncertainty associated with this ruler is +-0.5mm. So the tire tread has a depth of 7.0 mm +- 0.5mm. The amount of tire thread that has worn off is

11.2 mm - (7.0 mm +- 0.5 mm) = 4.2 +- 0.5 mm

b) The tire thread can anywhere between 3.1 mm and 3.5 mm. Since the lower limit has gone below the legal limit of 3.2 mm, it's time to change the tire.

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C = 2pi*r
Plug in the circumference
6.28 = 2*pi*r
3.14 = pi *r 
plug in pi
3.14 = 3.14 * r
r = 1


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