90-4x=80-3.5x what’s the value of x (hint: it’s not 1 1/3 or -1 1/3)

Can you answer my question? will mark brainiest!

An eight-sided die, which may or may not be a fair die, has four colors on it; you have been tossing the die for an hour and have recorded the color rolled for each toss. what is the probability you will roll a brown on your next toss of the die? express your answer as a simplified fraction or a decimal rounded to four decimal places.

Which is the graph of this function 3 square root of x plus one if