First you must change 3/8 into a decimal, so the number would be 45.375. To find scientific notation you have to move the decimal between a factor of 1-10. 4.5375 . You moved over the decimal once toward the left. so scientific notation would be 4.5375 X 10^1
3(4x - 4) - 7x, when simplified, is 5x - 12. So your answer would be A, or the first one.
60/2 equals 30 then 30x4 is 120. Is parents give him a 120$
