Please help me solve this simultaneous linear equation 100 points

Alonso walked with his friend andy one day, and wanted to compare their speeds. alonso walked 3 miles in one hour, and andy walked 2 miles in 2 hours. complete the table to graph the relationship for each person.

What is the axis of symmetry of the function f(x)=-(x+ 9)(x-21)

Lines a and b are parallel. what is the value of x? -5 -10 -35 -55