I believe the answer is D. because -12 + -1 equal -13
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>
This requires you to find the volume of the cone.
The volume of a cone is 1/3 the area of the base (a circle) times the height of the cone, or 1/3(3.14)r^2 * h.
The radius of the base is 7.5/2 or 3.75.
V = 1/3(3.14 * 3.75^2) * 3.5
V = 1/3(44.16) * 3.5
V = 1/3*154.56
V = 51.5 cm^3 of feed
Answer:
detail answer is given go through it .....
The answer is precisely -33