30,085 rounded to the nearest ten

If chord ab is congruent to chord cd, then what must be true about ef and eg?

Combine like terms to make a simpler expression 3z+z

The party planning committee has to determine the number of tables needed for an upcoming event. if a square table can fit 8 people and a round table can fit 6 people, the equation 150 = 8x + 6y represents the number of each type of table needed for 150 people.