Calcula la media armónica de los 30 números de la siguiente serie:

2; 6; 12; 20; …..

For a field trip to the zoo, 4 students rode in cars and the rest filled nine busess. how many students were in each bus if 472 students were on the trip

What is the expression in factored form? -x^2 + 3x + 28 a. (x-7)(x-4) b. -(x-7)(x+4) c. (x+4)(x+7) d. -(x-4)(x+7)

Based on the diagrams, what is the value of x?