The equation 5x + 7 = 0, gives the value of x which is

1. an irrational number
2. a whole number
3. a rational number
4. an integers

Rational number $\dfrac{p}{q}$ is in standard form, if:

1. p and q have no common factor and p ≠ 0
2. p and q have at least one common factor other than 1 and q ≠ 0
3. p and q have no common factor and q ≠ 0
4. p is divisible by q completely.

$-\dfrac{3}{7}$ + additive inverse of $-\dfrac{3}{7}$ is

1. 1

2. 0

3. $\dfrac{6}{7}$

4. $-\dfrac{6}{7}$

Add each pair of rational numbers, given below, and show that their addition (sum) is also a rational number:

$\dfrac{-5}{8}$ and $\dfrac{3}{8}$