(03.07A LC) The coordinate grid shows the graph of four equations:

Which set of equations has (3, 1) as its solution?
A and B

C and D

B and D

A and D

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 number 321,000,000 in scientific notation? also what is the number? ?

Which value of m will create a system of parallel lines with no solution? y = mx - 6 8x - 4y = 12