Answer:
We have hot summers and cold winters because of the tilt of the Earth's axis. The tilt of the Earth means the Earth will lean towards the Sun (Summer) or lean away from the Sun (Winter) 6 months later. In between these, Spring and Autumn will occur. The Earth revolves around the Sun.
Explanation:
Blake's mistake is (d) He divided the exponents in the parentheses instead of subtracting.
<h3>How to determine the mistake</h3>
The expression is given as:

The actual solution is as follows:

Add the exponents

Multiply 15 by 5

Blake's simplified expression showed that:
He divided 12 by -3 and then multiplied the result by 5
Hence, Blake's mistake is (d) He divided the exponents in the parentheses instead of subtracting.
Read more about expressions at:
brainly.com/question/4344214