Mathematics, 07.02.2021 01:30 williamlindley2
The formula A = P + Prt represents the value, A, of an investment of P dollars at a yearly simple interest rate, r, for t years. The equation to model the value, A, of an investment of $54 at 9.26% for t years is given by
A = 54 + 5t.
The equation to model the value, A, of an investment of $84 at 2.38% for t years is given by
A = 84 + 2t.
Assuming A has the same value, the given equations form a system of two linear equations. Solve this system using an algebraic approach and interpret your answer.
a.
t = 5
The two investments will reach the same value in 5 years.
c.
t = 1000
The two investments will reach the same value in 1000 years.
b.
t = 20
The two investments will reach the same value in 20 years.
d.
t = 10
The two investments will reach the same value in 10 years.
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