Solve each equation

1: 9v=1
2: 1.37w =0
3: 1 = 7/10 x
4: 12.1 = 12.1 +y
5: 3/5 + z =1

Li buys supplies so he can make and sell key chains. he begins to make a profit only after he sells 4 key chains. what point on the graph makes the most sense in this situation?

Indicate the formula for the following conditions: p^c(n,r)=

Find the unit rate. enter your answer as a mixed number. a fertilizer covers 2/3 square foot in 1/2 hour.