- How would covering the sandy banks of the pond affect the turtles’ life cycle?

Light from the sun reaches the earth in 8.3 minutes. the velocity is 3.00 x 10^8 m/s. how far is earth from the sun? i know how to get to d = (3 x 10^8 m/s)(498 sec). i just don't know how to get from there to the answer being 1.5 x 10^11 m.

In positive numbers less than 1, the zeros between the decimal point and a non-zero number are blank significant

Which accurately compares concave and convex lenses?