Add. Write your answer in scientific notation. (1.38×104)+(8×103) 9.38×1049 point 3 8 times 10 to the 4th power 2.18×1042 point 1 8 times 10 to the 4th power 9.38×1079 point 3 8 times 10 to the 7th power 2.18×107