What is the sum of 0.0421 g + 5.263 g +2.13 g to the correct number of significant digits?
A) 7 g
B) 7.4 g
C) 7.44 g
D) 7.435 g

Use the drop-down menus to answer each question. which runner finished the 100 m race in the least amount of time? which runner stopped running for a few seconds during the race? at what distance did anastasia overtake chloe in the race?

Astudent reacts 13 moles of iron with 21 moles of oxygen according to the following equation:

Two nails have identical sizes and shapes. in one nail, 20 percent of the domains are lined up. in the other nail, 80 percent of the domains are lined up. which has stronger magnetic force? first answer gets brainliest!