Answer:
1 hr on problems and 3 reading
Explanation:
1 hr on problems bc he's able to finish 40 problems which is better than reading for 1 hr since the teacher said reading for 1 hr is equivalent to solving 35 problems. in the 2nd, 3rd and 4th hours he solves less than 35 problems each hour so it's better to just read for an hour.
If Sagan scored 1200 divide 980 divide by 100 =3 Andrea =27 so I think that Andrea has the most then sagan 3×9=27
Answer:
Hygrometers
Explanation:
Barometer: a scientific instrument that we use to measure air pressure in an environment
Hygrometers: a hygrometer is a device that is used to measure the humidity in the air
Anemometer: for measuring wind speed and direction
Thermometer: a device that we use to measure temperature
Hair is not an instrument.