Answer:
I believe it is Option 1
Step-by-step explanation:
Since the fourth root of 81 will be 3 and of 16 will be 2.
It is given in the first sentence that Ms M does fitness training for one and a half hours a day.
Hence she spends 90 minutes a day in fitness training.
x∈[20/3;+∝).
3x+10≥30; ⇔ 3x≥20; ⇔ x≥20/3
