The price of a family dinner was $48.00. A sales tax added 5% to the final bill. The family left a $10.08 tip. If the family included the sales tax when calculating the tip, what percent did the family leave? A. 2% B. 10% C. 18% D. 20%

Interesting pattern in the decimal expansion of ${\displaystyle \frac{1}{243}}$
There appears to be an interesting pattern in the decimal expansion of
${\displaystyle \frac{1}{243}}$
${\displaystyle \frac{1}{243}=0.\overline{004115226337448559670781893}}$
I was wondering if anyone could clarify how this comes about?

Which of the following fractions below are proper fractions?
Also, which of those fractions are improper fractions?
${\displaystyle 3,\frac{3}{2},\frac{2}{3},\frac{8}{3},\frac{1}{3}}$

Consider thefollowing fractions: ${\displaystyle -\frac{1}{6},-\frac{5}{8},-\frac{7}{48}}$
Rewrite all 3 fractions with the lowest common denominator.

How to solve this? (adding polynomial fractions)
I'm having trouble solving this expression:
${\displaystyle \frac{(x-1)(7x+6)}{(x-1){(x+1)}^2}-\frac{7}{(x+1)}}$
What's the steps to solve this?
I know you expand ${\displaystyle {(x+1)}^2}$ to ${\displaystyle (x+1)(x+1)}$
and that you need to find a common denominator before adding the numerators together.
The final answer is ${\displaystyle \frac{-1}{x^2+2x+1}.}$
Thanks.

Find the sum by converting the mixed numbers to improper fractions: ${\displaystyle 3\frac{7}{10}+2\frac{9}{10}}$.

Solve: ${\displaystyle \frac{x+3}{4}=\frac{x-2}{3}+\frac{1}{4}}$.

What is the value of ${\displaystyle 5.79\cdot 3.6}$?