I believe that t he answer is the 2nd one
Answer:
Use the pythagorian theorm
Step-by-step explanation:
Option 2.
shows the correct way to use the quadratic formula to solve the given equation.
Step-by-step explanation:
Step 1:
For an equation of the form
the solution is
.
Here a is the coefficient of
, b is the coefficient of x and c is the constant term.
can also be written as 
Comparing
with
, we get that a is 1, b is -4 and c is -21.
To get the solution, we substitute the values of a, b, and c in
.
Step 2:
Substituting the values, we get


This is option 2.
3.5 years (so 4 years)
2500×0.065 (this gets the amout earned per year) =162.5
568.75÷162.5 (how many years to get the desired amount) =3.5