You expect to receive a $10,000 bonus after six years. You have calculated the value of this bonus today as $7,000. What interest rate is used in this calculation?

-7/8

step-by-step explanation:

instead of subtracting you add the -6/8 and -1/8

not only in mathematics, scientific proof also are required in the other field of science. also maths proofs are of particular structure, containing steps and logics. so proving is like doing science, it is science. that's why it is important to prove. 

an inaccurate proof leads to errors, or stating results that are not accurate.  which wil mess the probelm up you dont want this