Select all numbers that are correctly rounded.

a. 1.578 rounded to 1.57
b. 12.82 rounded to 12.8
c. 3256 rounded to 3250
d. 0.0259 rounded to 0.026

Let's go through each answer. 

1.578 rounded to 1.57?
This is incorrect, because it rounded down from 8, when it needed to round up. 
The correct way to round this number would be 1.58

12.82 rounded to 12.8
This is correct, because it rounded down from 2, which is what it's supposed to do.

3256 rounded to 3250
This is incorrect because it rounded down from 6 when it needed to round up.
The correct way to round this number is 3260

0.0259 rounded to 0.026
This is correct, because it rounded up from 9, which is what it's supposed to do. :)

The correctly rounded numbers are B and D. :)

Hopefully this helps! If you have any more questions or don't understand, feel free to DM me, and I'll get back to you ASAP! :)

If the heat engine is a perfect carnot cycle engine, thenefficiency = (t2-t1)/t2   where t1=temperature of cold reservoir ( ° k) = 135            t2=temperature of hot reservoir ( ° k)   = 325thereforeefficiency = (t2-t1)/t2 = (325-135)/325 = 0.5846 = 58%  note: this is the theoretical maximum efficiency of a perfect heat engine.   real-life engines do not achieve this value.

Ithink the answer would be a