Write an equation to represent the relationship: x=6, 8, 10, 12, 14, 16 y= 0, 1, 2, 3, 4, 5

Anyone know? will mark brainliest if you're correct!

Emily is entering a bicycle race for charity. her mother pledges $0.90 for every 0.75 mile she bikes. if emily bikes 18 miles, how much will her mother donate?

Plz hurry evaluate the expression a+b where a=8 and b=19