Find -8 1/4 divided (-2 5/12) write your answer as a mixed number in simplest form

Ricardo ran the 400 meter race 3 times his fastest time was 54.3 seconds his slowest time was 56.1 seconds if his average time was 55.0 seconds what was his time for the third race

What is the size of the matrix resulting from

X2 + y 2 = 36 x + y = 6 solve the system of equations.