(1 point) The concentration of salt in a fluid at (x, y,z) is given by F(x, y,z)=x2+y4+x2z2 mg/cm3. You are at the point (−1,−1,1). In which direction should you move if you want the concentration to increase the fastest? direction:

21

jk it's 20

step-by-step explanation:

answer: $53750

steps:

list the principal and interest after the n-th year:

n       principal   simple interest

1     12500     375

2     25000     750

3     37500     1125

4     50000     1500

sum: $50000     $3750

total at end of year 4: $53750