How do you write 31 billon in scientific notation

In the 30-60-90 triangle below side s has a length of and side r has a length

Follow these steps using the algebra tiles to solve the equation −5x + (−2) = −2x + 4. 1. add 5 positive x-tiles to both sides and create zero pairs. 2. add 4 negative unit tiles to both sides and create zero pairs. 3. divide the unit tiles evenly among the x-tiles. x =

Write a fraction less than 1, which has a denominator of 6 and is greater than 3/4 plz answer !