How many tens are in 20,000? (Answer in simple words!) Example: "38 tens", or "48 tens"

If 25% of y is 30, what is 60% of y?

Simplify the algebraic expression 8y-2(y+4)

At store a, erasers are sold individually. the cost y of x erasers is represented by the equation y=0.75x. the costs of erasers at store b are shown in the graph.