Factor completely x²-9
1 answer:
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Answer:
It is right
Step-by-step explanation:
Because the hypotenuse must be greater than all the legs, we have that is the hypotenuse. So, we want to determine if
.
This means the triangle is indeed right!
Answer:
The decibel range is
Step-by-step explanation:
Let
d -----> the decibel level of the music
we know that
The absolute value of the difference of the decibel level of the music and its average, must be less than or equal to 28 decibels
so
The absolute value that represent this problem is
Solve the absolute value
<em>First solution (positive)</em>
Adds 110 both sides
<em>Second solution (negative)</em>
Multiply by -1 both sides
Adds 110 both sides
therefore
The decibel range is