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:
551
Step-by-step explanation:
- When constructing inscribed polygons and parallel lines<span>, the </span>steps<span> are </span>different<span> as a compass is used to copy an angle. A compass is an .</span>
Answer:
The answer is 4.
Step-by-step explanation:
A=4.5
B=0.5
4.5-0.5=4
Answer:
ODC is 90
Step-by-step explanation:
look at the attachment
the quadrilateral must have 360 degrees in total so:
360 - (28+90+152)=90
