Which equation could be used to solve this problem?

kate weighs 3 times as much as jen. their total weight is 140 pounds. how much does each girl weigh?
a) 140 = 3x
b) 3x + x = 140
c) 3x - x = 140
d) x - 140 = 3x

Ateam has p points. p = 3w + d w = wins d = draws a) a football team has 5 wins and 3 draws. how many points does the team have?

The? half-life of a radioactive substance is 20 years. if you start with some amount of this? substance, what fraction will remain in 120 ? years

Alcoa was $10.02 a share yesterday. today it is at $9.75 a share. if you own 50 shares, did ou have capital gain or loss ? how much of a gain or loss did you have ? express the capital gain/loss as a percent of the original price