How do you know if 2 fractions are equivalent?

2x - 20 = 32 20 - 3x = 8 6x - 8 = 16 -13 - 3x = -10

What are the relative frequencies to the nearest hundredth of the columns of the two-way table?

Acollection of coins has value of 64 cents. there are two more nickels than dimes and three times as many pennies as dimes in this collection. how many of each kind of coin are in the collection?