Help me with these three quesions for brainiest:)
2 answers:
Answer:
See below.
Step-by-step explanation:
1) Two equations are equivalent if they have the same solutions.
2) As long as two expressions and
are equal, so
, adding the same value for both sides still makes the equation true, so
is true.
3) As long as two expressions and
are equal, so
, subtracting the same value for both sides still makes the equation true, so
is true.
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Length of circular track is:
L = 2*r*pi
He run 3/4 of it so length is:
L' = 3*2/4*r*pi = 3/2*r*pi
To calculate speed of his movement we use formula:
v = s/t where s = L' and t = 1 minute 45 seconds = 105 seconds
v = L'/t = 3*r*pi/2*105
v = r* pi/70
If we take that r = 1
answer
L = 2*r*pi
He run 3/4 of it so length is:
L' = 3*2/4*r*pi = 3/2*r*pi
To calculate speed of his movement we use formula:
v = s/t where s = L' and t = 1 minute 45 seconds = 105 seconds
v = L'/t = 3*r*pi/2*105
v = r* pi/70
If we take that r = 1
answer