Meredith practices the piano for 3 hours each week. How many hours will she practice in 8 weeks?

2 answers:

8 0

If Meredith practices 3 hours a week, and the question is asking how many hours she will practice in 8 weeks, the answer is 24. It is 24 hours because 3×8=24 :)
Hope I helped!! Please mark as Brainliest.

Elina [12.6K]3 years ago

4 0

The answer is 3 the number of hours in the week, multiplied by 8 the number of weeks she will practice, so the answer is 24.

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I need help.. A diameter of a circle has endpoints p(-10, -2) and q(4, 6)

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A: The center is the mid point of the diameter. So, the center of the circle will be the midpoint of points P and Q. The coordinates of the midpoint are the averaged coordinates of the endpoints.

So, the x-cooardinate of the center is the average of the x-coordinates of P and Q:

$C_x = \dfrac{P_x+Q_x}{2}=\dfrac{-10+4}{2}=\dfrac{-6}{2}=-3$

Try to do the same thing with the y coordinates, and you'll get the y-coordinate $C_y$ . This first part will be over, because the circle will be point

$C=(C_x,C_y)$

B: The radius is exactly half the diameter. So, we find the length of the diameter, and we divide it by 2. To find the length of the diameter, we use the standard formula for the distance between two points:

$d=\sqrt{(P_x-Q_x)^2+(P_y-Q_y)^2}=\sqrt{(-10-4)^2+(-2-6)^2}=\sqrt{260}=2\sqrt{65}$

Divide this length by 2 and you'll get the radius.

C: At this point, we have both the radius and the coordinates of the center. The equation of the circle depends on these two parameters, and it is

$(x-C_x)^2+(y-C_y)^2=r^2$

Substitute $C_x$ and $C_y$ with the coordinates of the center (found in point A.) and $r$ with the radius (found in point B.) and you'll have the equation of the circle.