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?

4 packs of water and 7 packs of candy bars

step-by-step explanation:

35x4=140

140/20=7

555.99.

step-by-step explanation:

hope this

c.

step-by-step explanation:

she should of added 9^2 and 12^2. that is because it is a^2+b^2=c^2. c^2 is the hypotenuse and should always be bigger than the other two numbers. which is why she should of added 9 squared and 12 squared together instead of 15 squared.