Please help. Trig: Laws of Cosines
If a rhombus whose side measures 10 and the smaller angle is 72*, find the length of the larger diagonal, to the nearest tenth.

At a local museum, the total price for one adult and one child is $11. mrs. smith paid for herself and her three children. she spent $19. record the system of equations to be solved and then find the price of an adult and child ticket using either elimination or substitution.