Calculate the following, and round to the correct number of significant figures: a. (3.1 10^2 cm)x(1.22 10^4 cm)
b. (2.99x10^5km)x(6.88x10^2km)
c. (5.75x10^-5m)/(9.9x10^-2m)
d. (7.83x10^4m)/(3s)

If element x has 99 protons how many electrons does it have

Four 5-gram blocks of metal are sitting out in the sun and absorb the same amount of heat energy. use the following specific heat capacity data to determine which block will increase its temperature the most.

Macy always thought there were only a few hair colors blonde brown and black however when she actually began looking around she saw varying shades of these hair color what is a possible reason for so many different hair colors