From centimeters to meters what direction does the decimal move

The focal length of a relaxed human eye is approximately 1.7 cm. when we focus our eyes on a close up object, we can change the refractive power of the eye by about 16 diopters. (a) does the refractive power of our eyes increase or decrease by 16 diopters when we focus closely? explain. (b) calculate the focal length of the eye when we focus closely.

The free body diagram shows a box being pulled to the left up a 25-degree incline. the magnitude of the normal force is

An isotope undergoes radioactive decay by emitting radiation that has a –1 charge. what other characteristic does the radiation have?