Martha estimated there were 85 marbles in a jar for a contest. the actual number of marbles in the jar was 107. what was the percent error of martha's estimation?

21%.  

Step-by-step explanation:

We have been given that Martha estimated there were 85 marbles in a jar for a contest. The actual number of marbles in the jar was 107.

We will use percentage error formula to answer our problem.

Let us substitute our given values in above formula.  

Therefore, the percent error of Martha's estimation is 21% to the nearest percent.

we'll this would mean that the dunk tank and the bounce house are the same for 20 hours because the 2 represents that the two activities, and the 20 represents the amount of hours they both are. so with this said, it means that the answer is c. the costs for a dunk tank and bounce house are the same for 20 hours.

c.the costs for a dunk tank and bounce house are the same for 20 hours.

hope this .

not sure but it may be b, as i said i'm not sure.