If (x)sin(2y) = (y)cos(2x), then what is dy/dx at the point (π/2 , π/4) ? A. -1
B. 0
C. 1
D. 2

Please show work.

Abox of chocolates costs $7. which equation relates the number of boxes sold (x) and total cost of the boxes sold (y)?

Measures of the angle of r, 31 s (x+4) t (3x+9)

Acoffee shop orders at most $3,500 worth of coffee and tea. the shop needs to make a profit of at least $1,900 on the order. the possible combinations of coffee and tea for this order are given by this system of inequalities, where c = pounds of coffee and t = pounds of tea: 6c + 13t ≤ 3,500 3.50c + 4t ≥ 1,900 which graph's shaded region represents the possible combinations of coffee and tea for this order?