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Q: What is the value of n in this equation 2n plus 1 equals 21?

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21

There is no variable, and the equation is not valid.

5

Zero.

n + 13 = 21. n = 21 - 13

It is an equation and the value of x is 7

-21

It is a symbolic equation which requires triangle = 21.

The value of x is -21.

21

21 is the only solution of that equation.

3x + 7 = -4x + 28 implies 7x + 7 = 28

15

It is: x2-10x+21 = 0 and the value of x is 3 or 7 when solved

The value of x is 29

2

Multiply the first equation by 3 to give 9x + 15y = 21

Multiply first equation by 3: 9x + 15y = 63Add that and second equation: 19y = 57Divide by 19: y = 3, so x = 2

The y-intercept of that line is the point (0, 21).

The mathematical statement 31 plus 21 equals 52 as a total.

21+21+19+19=80

This quadratic equation has no solutions because its discriminant is less than zero.

12 plus 9 equals 21.

9+12

66.