How many solutions are in the equation 4x-9(x+1)=20-5x

The axis of symmetry for the graph of the function f(x)=1/4^2+bx +10 is x=6. what is the value of b?

Determine the difference: 3.2 × 1010 – 1.1 × 1010. write your answer in scientific notation.

Out of $20$ creepy-crawly creatures in a room, $80\%$ are flies and $20\%$ are spiders. if $s\%$ of the total legs belong to spiders, what is $s$?