When the figure skater squatted down during her spin, she didn’t speed up or slow down. Why did changing her shape in this manner not affect her spin?

It's called a conservation of angular momentum; a spinning object will remain spinning unless acted upon by an outside force.

Explanation: Her changing her shape is not an outside force.

Her mass didn’t change or move any closer to her center of rotation. So, her speed of rotation did not change.

Explanation:

pluto

for this case, we must find the number of deaths per day of the year 2015, in automobile accidents, knowing that 32,400 people died.

knowing that the year 2015 had 365 days we have the following division:

where "x" represents the number of deaths per day.

rounding off we have:

approximately, 89 people per day died in 2015

answer:

89 people per day

substitute y = 2x - 4 to x + 2y = 12:

x + 2(2x - 4) = 12     use distributive property

x + (2)(2x) + () = 12

x + 4x - 8 = 12     add 8 to both sides

5x = 20     divide both sides by 5

x = 4

put the value of x to the first equation:

y = 2(4) - 4

y = 8 - 4

y = 4