Answer: First option
Step-by-step explanation:
You have the quadratic equation given in the problem:

To find an equivalent expression you cacn factorize. Find two numbers whose sum is -13 and whose product is -30.
These numbers would be -15 and 2.
Therfore, you obtain the following equivalent expression:

If you don't want to apply the method above, you can use the quadratic formula:

Where:

When you susbstitute values you obtain that:

Then you can rewrite the equation as 
Answer:
Step-by-step explanation:
6 lol
Answer:
the Radio was 52.8%
Step-by-step explanation:
60-12%=52.8
1.

2.

3. -7/30
4. i believe it is the communitive of multiplication , but not 100% sure
Answer:
The answer is 180°
Step-by-step explanation:
Replace the variables in with your angle measurements and add them up. Triangles should end up with a 180° all combined.