There are three piles of dimes, with 15 in the first pile, 21 in the second pile and an unknown amount in the third pile. If each pile is doubled, there will be $9.00 in dimes. How many dimes are
there in the third pile?

17 in long 1.3 ft wide and 8in high what is the volume

Afarmer has a large field that is x feet in length. he wants to fence in a rectangular section in the middle of the field , leaving a length of 100 feet of open field behind each end of the fenced rectangle.he also wants the width of the fenced-in space to be 100 feet less than its length. find the expressions to represent the length and width of the fenced section of the field

The graph shows the decibel measure for sounds depending on how many times as intense they are as the threshold of sound. noise in a quiet room is 500 times as intense as the threshold of sound. what is the decibel measurement for the quiet room? 20 decibels28 decibels200 decibels280 decibels