The answer for this question would be: the second one.
Answer:
Hope it helps u
Step-by-step explanation:
Check this image it contain ur part a
for part b post this question again then tag me i will solve it properly for u for any doubt just ask ok!!!!!!
1+3x
Distribute -7 through the parenthesis
Answer:
The speed of sound is 
Step-by-step explanation:
Let
x-----> the speed of sound
we know that

so

solve for x
