We would need the fractions given
A petri dish is simply a circle; thus, we use the formula of the area of the circle which is <span>πr^2.
Given r = 40 mm
A = </span>π(40)^2 = <span>5026.55 sq. mm
</span>
Population density = bacteria count / area
PD = 2,100 / <span>5026.55
PD = </span><span>0.417782 bacteria / mm sq.
Therefore, the answer is approximately 0.418 </span><span>bacteria per square millimeter.</span>
Answer:
Step-by-step explanation:
1)down 8 up 10
2)11.2
3)9+9+9+9+9=45
4)middle
5)77.0
Answer:
4.5 kilometers
Step-by-step explanation:
it is obtained by simply multiplying 0.75 with 6 km.the shortest and brief answer
Answer:
Number Three
Explaination:
Whenever something says "___ than" thats means it goes after. Then x twice is 2x
