Answer:
29.5 cm ; 86.25 cm
Step-by-step explanation:
a) For 30 cm measured to the nearest cm, the lower bound is 29.5 cm. This is because any value from 29.5 cm to 30.4 cm would round to 30 cm when rounded to the nearest cm. So, the lower bound for 30 cm is 29.5 cm.
b) For 86.3 cm measured to the nearest tenth of a cm, the lower bound is 86.25 cm. This is because any value from 86.25 cm to 86.35 cm would round to 86.3 cm when rounded to the nearest tenth of a cm. So, the lower bound for 86.3 cm is 86.25 cm.
