Find the percent of a dollar each set of coins makes? 1 nickel and 4 pennies

If sin(x) = 0 and cos(x) = 1, what is tan(x)?

Ihonestly have no clue if it's each or none.

What are the interpretations of the line 3x - 15y = 60? x-intercept y-interception a: x 20 - y -4 b: x 5 - y 20 c: x -3 - y 15 d: x -4 - y 20