the first thing to do is to subtract 16 from both side of the equation:
16 - 16 - b = 7 - 16
the 16s on the left cancel out resulting in:
-b = -9
think of the -b as -1(9). this is multiplication. by doing the inverse operation (division) we can get rid of the negative on the b. we will divide both sides by -1.
this leaves a positive b. since both parts of the right side of the equation are negative it becomes positive ( a negative divided by a negative is a positive).
the final answer is b= 9.
check our work by plugging in the b value (9) into the original equation:
16 - 9 = 7
7 = 7 is true so we now we have the right answer.
c. the volume of the sun is approximately one thousand times the volume of jupiter.
the volume of the sun is approximately 1 × 10^18 cu km, while the volume of jupiter is approximately 1 × 10^15 cu km.
we can take the ratios of the volumes of sun to jupiter.
volume of sun / volume of jupiter = (1 × 10^18 cu km) / (1 × 10^15 cu km)
volume of sun / volume of jupiter = 1000.
volume of sun = 1000 x volume of jupiter.