¿Cómo expresar números enteros en notación científica?

The slope of a velocity time graph over any interval of time gives the during that interval

Light traveling in water, nwater = 1.33, strikes a plastic block at an angle of incidence of 51.4°; part of the beam is reflected and part is refracted. if the index of refraction of the plastic is 2.0, what is the angle made by the reflected and refracted beams?

What is an aquifer for science class