What is the best way to answer questions with a x expression in the question. for example 3x + 10x=?

Question 3(multiple choice worth 1 points) use the arc length formula and the given information to find r. s = 16 cm, θ = 48°; r = ? sixty divided by pi cm thirty divided by pi cm one third cm one hundred twenty divided by pi cm

Ratio of circumference to diameter example plz i need to now what it looks like.

Identify the number as a regional or irrational.explain. 291.87