Which number in written in scientific notation? (big points reward)

a: 7.8 x 10^-5
b: 3.2 x 100^2
c: -5 x 10^-12
d: 0.84 x 10^6

Which ordered pair is a solution of the equation? 2x+3y=10

Urgent? will give brainliest to the first correct answer what is the area of the figure?

Anew movie is released each year for 14 years to go along with a popular book series. each movie is 2 minutes longer than the last to go along with a plot twist. the first movie is 70 minutes long. use an arithmetic series formula to determine the total length of all 14 movies