Mystery Case. Problems include adding, subtracting, multiplying, and dividing fractions and decimals, and parenthesis (no negatives and no exponents).You are a detective and receive a call for another mystery case. You receive clues from a secret informant, which are coded to prevent them from falling into the wrong hands.This morning it was noticed that all street name plates in Silentstone have disappeared. Residents say they heard strange sounds during the night. Who could have stolen the nam