Yesterday, Selma read 75 pages of her book. If she reads at a pace of 2 pages per minute today, which table shows only viable so
2 answers:
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Answer:
Mary is filling 36 cups per minute, which is faster than Jorge.
Step-by-step explanation:
Lets get Jorge's time :
As the rate is constant, we can find the slope to know the number of cups he is filling per minute.
Slope is found using:
=
=
From the table lets get Mary's time:
=
Another data:
=
Therefore, we can see that Mary is filling 36 cups in a minute and Jorge is filling 14 cups.
Hence, the correct answer is : Mary is filling 36 cups per minute, which is faster than Jorge.
Answer:
Step-by-step explanation:
Lets call x,y the numbers we obtain from the calculator. x and y are independent random variables of uniform[0,1] distribution.
Lets note that, since both x and y are between 0 and 1, then 1 is the biggest side of the triangle.
Lets first make a geometric interpretation. If the triangle were to be rectangle, then the side of lenght 1 should be its hypotenuse, and therefore x and y should satisfy this property:
x²+y² = 1
Remember that in this case we are supposing the triangle to be rectangle. But the exercise asks us to obtain an obtuse triangle. For that we will need to increase the angle obtained by the sides of lenght x and y. We can do that by 'expanding' the triangle, but if we do that preserving the values of x and y, then the side of lenght 1 should increase its lenght, which we dont want to. Thus, if we expand the triangle then we should also reduce the value of x and/or y so that the side of lenght 1 could preserve its lenght. With this intuition we could deduce that
x²+y² < 1
Now lets do a more mathematical approach. According to the Cosine theorem, a triangle of three sides of lenght a,b,c satisfies
a² = b²+c² - 2bc* cos(α), where α is the angle between the sides of lenght b and c.
Aplying this formula to our triangle, we have that
, where
is the angle between the sides of lenght x and y.
Since the triangle is obtuse, then , and for those values
is negative , hence we also obtain
1 > x² + y²
Thus, we need to calculate P(x²+y² <1). This probability can be calculated throught integration. We need to use polar coordinates.
(x, y) = (r*cosФ,r*senФ)
Where r is between 0 and 1, and Ф is between 0 and (that way, the numbers are positive).
The jacobian matrix has determinant r, therefore,
As a conclusion, the probability of obtaining an obtuse triangle is .