Aretired couple invested $1 in bonds. at the end of one year, they received an interest payment of $690. what was the simple interest rate of the bonds?

Rate of interest = 6.9 %

Step-by-step explanation:

Given in question as,

principal invested = $10000

Interest credited = $ 690

Time taken for the Principal amount = 1 year

Now the interest is applies on simple interest

SO, simple interest =

Or, SI =

Or,  690 =

∴ Rate =

Hence Rate of interest= 6.9 %       Answer

a4 - 3a2 - 1

step-by-step explanation:

step   1   :

equation at the end of step   1   :

  ((a4) -   3a2) -   1

step   2   :

trying to factor by splitting the middle term

2.1     factoring   a4-3a2-1  

the first term is,   a4   its coefficient is   1 .

the middle term is,   -3a2   its coefficient is   -3 .

the last term, "the constant", is   -1  

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