First you do (2x-5) witch is -3x
Then you 5x times -3x and it will be 12x
Answer:
It doesn't.
Step-by-step explanation:
If you plug in 6 in the x spots you will have:
<h3>4(6)-5 < 19</h3>
If you solve that, you will get:
<h3>19< 19</h3>
So considering that they are the same number, this doesn't make sense because it should be an equal sign.
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We know that the formula for calculating distance is:
distance d = velocity v * time t
Calculating for each interval:
1: 25 km/hr for 4 minutes
d1 = (25 km / 60 min) (4 min) = 1.67 km
2: 50 km/hr for 8 minutes
d2 = (50 km / 60 min) (8 min) = 6.67 km
3: 20 km/hr for 2 minutes
d2 = (20 km / 60 min) (2 min) = 0.67 km
The total distance covered is:
d = d1 + d2 + d3
d = 1.67 + 6.67 + 0.67
d = 9 km
The average speed is:
s = 9 km (1000 m / km) / (14 min * 60 s / min)
s = 10.72 m / s
