¿Qué energía potencial tiene la masa contenida en 13 hectómetros cúbicos de agua embalsada a una altura de 10 metros, si la densidad del agua es de 1 g/cm cúbico?

the entire statement is true and correct.  

there's no diagram, nothing is illustrated, and no question is asked.

it's when something is going so fast it makes a loud noise, breaking the sound barrier, for example: a jet makes a loud noise, not only cause of the jet but because they reached a point where they went so fast that you can year the noise from various parts, kinda like a police car, lets say the car was going   so fast that you hear the siren of the cop car right next to you, but the car is probably a mile a way, it's cos the siren was next to you a few seconds if you understand me

305.7

explanation:

density =m/v

density =917/3.00

density = 305.

approximately = 305.7

in four significant figures

the answer is c. the lower legs are levers, and the knees are fulcrums. the ankles hold the loads.