Answer:
Step-by-step explanation:
Given
Required
How fast is the ball seem to be moving?
This question illustrates relative velocity;
Since the ball and the train moves in the same direction, the required velocity relative to the person standing behind is:
i.e. we add both velocities
It is said the blue card is a rectangle, so you don’t have to minus the inside rectangle. :)
You have to get from $30 to $21.75
21.75/30=0.725 x 100= 72.5% of the original price
<span>90/x=100/18</span>
<span>(90/x)*x=(100/18)*x - </span> multiply both sides of the equation by x
<span>90=5.55555555556*x - </span>divide both sides of the equation by (5.55555555556) to get x
<span>90/5.55555555556=x </span>
<span>16.2=x </span>
<span>x=16.2</span>
<span>18% of 90=16.2
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43, 47, is the composite numbers between 41 and 50
