¿Cuál serie numérica tiene como regla general Xn = 2n +1? a. 3, 5, 7, 9
b. 2, 4, 5, 8
c. 4, 6, 8,10
d. 2, 3, 4, 5

The series of numbers that correspond to the general rule of   is {3, 5, 7, 9}.

Step-by-step explanation:

We are given with the following series options below;

a. 3, 5, 7, 9

b. 2, 4, 5, 8

c. 4, 6, 8,10

d. 2, 3, 4, 5

And we have to identify what number series has a general rule as .

For this, we will put the values of n in the above expression and then will see which series is obtained as a result.

So, the given expression is ;

If we put n = 1, then;

If we put n = 2, then;

If we put n = 3, then;

If we put n = 4, then;

Hence, the series of numbers that correspond to the general rule of   is {3, 5, 7, 9}.

answer: standard form is ax^2 + bx + c = 0

step-by-step explanation:

standard form is ax^2 + bx + c = 0

(2x + 1)(x - 2) = 0

distribute to get into standard form

2x^2 - 4x + x - 2 = 0

2x^2 - 3x - 2 = 0

a = 2, b= -3, c = -2

a is your answer