There are23tablesinthelibray. each table has 4chairs. third graders fill the chairs at 3 tables. fourth graders fill the chairs at 6tables.

the 4th choice is the correct one

step-by-step explanation:

answer

d. 10

explanation

the distance from point y to wx is the height of the triangle.

using pythagoras theorem,

group similar terms to get,

this implies that,

take positive square root of both sides to get,

this implies that,