6 Write the standard form of the following:
(a) 4,00,00,000 +90,00,000+8,00,000 +70,000 + 500 +90
7 키
(b) 400,00,000 + 50,000 + 6,00 + 90​

Samantha swam upstream for some distance in one hour. she then swam downstream the same river for the same distance in only 12 minutes. if the river flows at 4 mph, how fast can samantha swim in still water?

If sr is 4.5cm and tr is 3cm, what is the measure in degrees of angle s?

Awater holding tank measures 105 m long, 50 m wide, and 8 m deep. traces of mercury have been found in the tank, with a concen- tration of 60 mg/l. what is the total mass of mercury in the tank? answer in units of kg.