Define the term amphiphilic and describe how it determines the arrangement of phospholipids into a bilayer.

Amphiphilic means that there is both a hydrophilic and hydrophobic part.

Explanation:

There are two parts to the phospholipids, a head an a tail. The head group is hydrophilic (Likes water) and the tail is hydrophobic (hates water). Bilayer means to layers, so there are two sections with the heads pointed out or inwards in regard to the cell and the tails intertwine with each other

9.9 years

a = p(1 + rt) . . account balance after time t at rate r starting with principal p

3000 = 2500(1 + 0.0202t) . . filling in the given numbers

1.2 = 1 + 0.0202t . . divide by 2500

0.2 = 0.0202t . . . subtract 1

0.2/0.0202 = t ≈ 9.901

it will take about 9.9 years for the account balance to reach $3000.

the real answer is b. scintillation counter