An investment of $2400 at t = 0 accumulates at a force of interest t=0.41+tt=0.41+t. Find the amount of interest earned in the 6th6th year.

Find the present value of $6000 due at the end of 6 years if the force of interest t=0.03+0.02tt=0.03+0.02t.

The accumulated amount in a savings account at any time t is given by A(t)=6700(1+0.042t)2A(t)=6700(1+0.042t)2. Find the time when the force of interest equals 0.04.

An investment accumulates at a force of interest t=0.04t5+0.03t2t=0.04t5+0.03t2. Find the present value at time t = 0 of $7800 due at the end of 4.9 year.

An investment pays $1700 at the end of 5 years and $2600 at the end of 9 years. Find the present value of this investment at time 0 if the force of interest t=0.03(1+t)2t=0.03(1+t)2.

they are five seperate questions