Monica deposits $ 3500 in a certificate and 6 months later she gets back $4000.Assume she is collecting simple interest.

just add them

Step-by-step explanation:

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a complex number is a number that can be expressed in the form a + bi, where a and b are real numbers, and i is a solution of the equation x2 = −1. because no real number satisfies this equation, i is called an imaginary number. has no real solution, since the square of a real number cannot be negative.