31/8 ÷(x−4 7/28 )= 17/18 +1 5/6

0.5(x−12)+0.2(x+7)=0.3x+3.4

1÷2 7/9 =x+4 2/5 x

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?

The function f(x) = 14,600(1.1)* represents the population of a town x years after it was established. what was the original population of the town?

Which of the following parabolas opens down?