A piece of charcoal was unearthed at an archeological site and found to contain 10% of its original carbon-14. The half- life of carbon-14 is 5,730 years. Which equation can be solved to determine the age of the charcoal?

One side of a rectangle is 7 feet shorter than seven times the other side. find the length of the shorter side if we also know that the perimeter of the rectangle is 306 feet.

What percent of 18 is 24? and plz explain thx.

22. catie is starting a babysitting business. she spent $26 to make signs to advertise. she charges an initial fee of $5 and then $3 for each hour of service. write and solve an inequality to find the number of hours she will have to babysit to make a profit. interpret the solution.!