(40 points) what is the recursive rule for the sequence? −7.4, −21.2, −35, −48.8, −62.6,  an=an−1−13.8 , where a1=−7.4 an=an+1+13.8 , where a1=−7.4 an=an+1−13.8 , where a1=−7.4 an=an−1+13.8 , where a1=−7.4

a1 = -7.4

an = an-1 - 13.8

Step-by-step explanation:

To find the common difference  take the second term and subtract the first term

-21.2 - (-7.4) = -13.8

Check by taking the third term and subtracting the second term

-35 - (-21.2) = -13.8

The common difference is -13.8

The first term is -7.4

Recursive rule

Means finding the next term in terms of the previous

a1 = -7.4

an = an-1 - 13.8

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.

the 3rd on is correct

step-by-step explanation: