Mr yang’s son has a total of twenty-one $1 and $2 coins in his money box. when he counts his money, he finds that its total value is $30. how many coins of each type does he have?

[15 points, algebra 2]simplify the complex fraction and find the restrictions.

If cos(2x) = tan^2(y), show that cos(2y) = tan^2(x).

Choose the equation below that represents the line that passes through the point (2, 4) and has a slope of 3. a) y − 4 = 3(x − 2) b) y − 2 = 3(x − 4) c) y + 4 = 3(x + 2) d) y + 2 = 3(x + 4)