15-2X = -45 7X+2=5X+12
How do i show my work for these 2 equations (I need the answer)

Divide: 1573 ÷ 7 = a) 222 r5 b) 223 r6 c) 224 r5 d) 224 r3

The number if marbles of different colors stored in a hat is listed below: 4 red marbles 10 green marbles 7 blue marbles. without looking in the hat, dan takes out a marble at random. he replaces the marble and then takes out another marble from the hat. what is the probability that dan takes out a blue marble in both draws?

The interior angles formed by the side of a hexagon have measures of them up to 720° what is the measure of angle a