Fill the 7L jug right up, then fill the 2L jar from it twice. What remains in the 7L jug is 3L.
Measure it.
You can add 289 and 7 together without estimating. you can add 2, 8, 9 and 7 together without estimating. If you have to, 290 and 7 = 297.
You can add those together without estimating and get 7.6 If you have to, 1.0 + 6.7 = 7.7
exactly
NO
Impossible to answer without knowing EXACTLY what you have.
exactly is the atmosphere if it is not just air
Exactly as in the question or as 1250 without the decimals
You cannot.
February, without a leap year, has 28 days - exactly 4 weeks. If you include Monday-Friday as "weekdays", that would give you exactly 20 weekdays.
Can't be answered without a DETAILED description of EXACTLY what you have.
No way to answer without knowing exactly which model it is.