if r + t = s and r - t = -s which of the following must be equal to t? (A) 5, (B) 15, (C) 20, (D) 45, (E) 80

Convert the mixed numbers into improper fractions. convert the improper fraction to mixed numbers.

Apassenger train and a freight train leave san jose at 3pm, traveling in the same direction. the passenger train is going three times as fast as the freight train. at 6pm they are 240 miles apart. how fast is each travelling? explain your answer and show your

What is the area of the shaded sector?