Please answer this correctly,,, This is a huge part of my grade. And who ever answers correctly will get brainliest!

Helium decays to form lithium. which equation correctly describes this decay?

Can anyone answer these questions? ? i need it before 1: 00pm today

Light travels through space at 186,282 miles per second and it takes about 1.3 seconds for light to travel from the moon to earth. which of the following is the correct method of finding the distance, in miles, between the moon and earth? add 186,282 and 1.3 divide 186,282 by 1.3 multiply 186,282 by 1.3 subtract 1.3 from 186,282