There is no equation. There is just a polynomial shown
Anwser is b
Because I just did the same quiz
If the two buses are 640 miles apart after 5 hours. Then the rate of each bus will be 57 miles per hour and 71 miles per hour.
<h3>What is speed?</h3>
The distance covered by the particle or the body in an hour is called speed. It is a scalar quantity. It is the ratio of distance to time.
We know that the speed formula
Speed = Distance/Time
Two buses leave a station at the same time and travel in opposite directions.
One bus travels 14 miles faster than the other.
Let x be the speed of first bus. Then the speed of the second bus will be (x + 14).
If the two buses are 640 miles apart after 5 hours.
Then the rate of each bus will be
Then the relative speed of the buses will be
S = x + x + 14
S = 2x + 14
Then the value of x will be
2x + 14 = 640 / 5
2x + 14 = 128
2x = 114
x = 57 miles per hour
Then the speed of the other bus will be
⇒ 57 + 14
⇒ 71 miles per hour
More about the speed link is given below.
brainly.com/question/7359669
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Let x be the number of 20 ton cars
Then,
380<{15(22-x)+20x}<400
380<{330-15x+20x}<400
380<{330+5x}<400
Subtract 330 on both sides
50<5x<70
Divide both sides by 5;
10<x<14
Therefore, the range of 20 tonne cars is between 10 and 14 cars.
The formula is 2 number of elements in the set This set {1,2,3} has 3 elements, so the number of subsets is gotten by substituting 3 for the number of elements in the set: 2 number of elements in the set = 23 = 2x2x2 = 8 So there are 8 subsets. They are 1. { } or ∅, the empty set, sometimes called the "null" set. 2.
