Richard took a loan of $10,000 at a rate of 7%. If he paid $14,00 in interest, how many years did it take him

to pay ck the loan?

you really need to say if these are simple interest or compound interest problems

if simple interest
I = Prt
14000 = 10000 * .07 * t
14000 = 700t
14000 / 700 = t
20 = t

or did you mean 1,400 in interest
1400 = 700t
2 = t

OK

10,000 @ 7% interest is $700 in interest per year.

If that number is $1400 - then he took the loan a 2 year loan.
If that number is $14,000 - then he took the loan for 20 years.

I think it is supposed to be 1400 in interest, which would mean he paid for a 2 year loan.