The fraction of the surface area of a pond covered by algae cells double every week. Today, the pond surface is fully covered with algae. This situation can be modelled C= (1/2)^t, where C is the fraction of the surface area covered by algae t weeks ago. When was 25% of the pond covered?

constant of proportionality = 3 and the equation is c = 3p.

step-by-step explanation:

c = kp   where c = amount of caffeine in mg., p = oz of pepsi and k is the constant of proportionality.

substituting the values given:

24 = 8k

k = 3.

the same value of k will be obtained if we substitute the other given values.

for this case we have that by definition, the surface area of a cylinder is given by:

where:

r: it is the radius of the cylinder

h: it is the height of the cylinder

we can also rewrite it as:

where:

la: it's the lateral area

ba: area of the base

option a

this is a good question! i’ll do some research and what i find, i’ll contact you asap when i have something! ✊