What is
(-12/13)+1/13

Aplot of land has been surveyed for a new housing development with borders ab, bc, dc, and da. the plot of land is a right trapezoid with a height of 60 feet and an opposite leg length of 65 feet

240 seventh graders and two-thirds of the students participate in after-school activities how many students participate in after-school activities

Is experimental probibilty the same as the observed frequency in math? i need the answer asap!