Find the area of Rhombus if its diagonals measure 18 cm and 21 cm

What is f(3) for the quadratic function f(x)= 2x^2+ + x - 12

In the following situation, determine whether you are asked to determine the number of permutations or combinations. then do the calculation how many ways are there to pick a starting five from a basketball team of twelve members? a. permutation; ps - 2520 b. combination; 1c, - 792 c. combination: 2cs - 2520 d. permutation; ps - 95040

Answer! if you don’t mind, can you explain