Sally has seven times as many dimes as nickels. the total value of the coins is $3.00. how many nickels does she have?
4 nickels
7 nickels
28 nickels
38 nickels

Bismuth-210 is an isotope that radioactively decays by about 13% each day, meaning 13% of the remaining bismuth-210 transforms into another atom (polonium-210 in this case) each day. if you begin with 233 mg of bismuth-210, how much remains after 8 days?

Aboat costs 19200 and decreases in value by 12% per year. how much will it cost in 5 years

Rick is driving to his uncles house in greenville,which is 120 miles from ricks town .after covering x miles rick she's a sign stating that greensville is 20 miles away. which equation when solved will give the value of x. a: x+120 = 20 b: x x120 =20 c: x +20 equals 120 d: x x20= 120