What does this mean 405(8) in math?

Arestaurant chef made 1 1/2 jars of pasta sauce. each serving of pasta requires 1/2 of a jar of sauce. how many servings of pasta will the chef be bale to prepare using the sauce?

Ab based on the given diagram, if m_1 = 60° then m 2 = 30 60 90 180

Complete the solution of the equation. find the value of y when x equals to 6 4x+y=20