Show that $0 . \overline{142857}=\frac{1}{7}$

Fill in the blanks so as to make each of the following statements true (Final answer only)

The decimal expansion of $\frac{47}{50}$ is of $\ldots \ldots \ldots$ type.

Fill in the blanks so as to make each of the following statements true (Final answer only)

$\sqrt{1 \frac{25}{144}}=\ldots \ldots$

Add $: 0 . \overline{35}+0 . \overline{28}$

Simplify the following expressions

$(\sqrt{15}+\sqrt{7})(\sqrt{15}-\sqrt{7})$

Find three rational numbers between

$-1$ and $-2$