So,
5y*3 is the open phrase the student uses to model "the sum of 5y and 3".
"The sum of" means addition. The student put 5y*3, while the sum of 5y and 3 is actually 5y + 3.
The answer to this is 2. Ten only has two factors, 5 and 2, and 2 can be decided evenly amongst them all.
The percentage of buttons that are large is 75%.

Step-by-step explanation:
We know that
cos 2x = 2cos²x - 1
So we have

Substituting 

Answer:

Step-by-step explanation:
<u>Step 1: Distribute</u>




Answer: 