Answer:
+1+3
Step-by-step explanation:
1 +1=2
2+3=5
5+1=6
6+3=9
For x²+bx+c, to complete the square, you add (half of b)²
b=8 in this case, so you add 4², which is 16
x²+8x+16-16-4
y=(x+4)²-20 is the final form.
It will take 0.556 seconds for an echo to reach one's ears
<h3>Calculating the time to hear an echo</h3>
From the question, we are to determine how long it would take an echo to reach one's ears
From the formula,

NOTE: To hear an echo, the sound will travel to and fro, hence, it will cover twice the distance
From the given information,
Distance = 92.0 m
NOTE: Speed of sound in air at 0 °C ≅ 331 m/s
Putting the parameters into the formula, we get


Time = 0.556 secs
Hence, it will take 0.556 seconds for an echo to reach one's ears.
Learn more on Calculating the time to hear an echo here: brainly.com/question/16676723
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Answer:
-3(10) - 4
Step-by-step explanation:
-3(10 - 4) = -18
-3(10) - 4 = -34
-30 - (-12) = -18
-3(10) - (-3)(4) = -18
-18 = -18
Answer:
x/5+9/5=y or x+9/5=y
Step-by-step explanation:
y= 5x-9
x=5y-9
x+9=5y
x+9/5=y