9.A new classroom is 10.5 metres by 5.2 metres. Each child needs 2m2 of space.

How many children are allowed in the classroom? Round to the nearest whole number

Abcd is a square. what is the measure of angle bac

Aculture started with 4,000 bacteria. after 5 hours, it grew to 5,200 bacteria. predict how many bacteria will be present after 19 hours. round your answer to the nearest whole number.

If 1.4% of the mass of a human body is calcium, how many kilograms of calcium are there in a 165-pound man? 1.0 kg ca 5.1 kg ca 1.0 x 102 kg ca 5.1 x 102 kg ca