Answer:
15
Step-by-step explanation:
5a - 10b = 45
5a - (10×3) = 45
5a - 30 = 45
5a = 45 + 30
5a = 75
a = 15
The speed of sound is
Let
x-----> the speed of sound
we know that
so
solve for x
I do not know what the rest of the problem is so I can not answer
D. -7, 0, 6
ZEROS:
x = 0
x = 6
x = -7
Hope this helps!