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3 years ago

If you Bike for 3 hours at 10mph and then walk for 1 hour at 2 mph. What would be your average speed?

Mathematics

1 answer:

faltersainse [42]3 years ago

8 0

Answer:

Average speed is 8 miles per hour.

Step-by-step explanation:

Given : If you bike for 3 hours at 10 mph and then walk for 1 hour at 2 mph.

Hope this helped!

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Given that BCA = 15° and mangle DCE = 38°, find ACE.

Olenka [21]

A 37 is the answer okay

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3 years ago

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Anastasy [175]

Answer:

Step-by-step explanation:

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3 years ago

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hile sitting in physics class one day, you begin to ponder the workings of the analog clock on the classroom wall. You notice as

PSYCHO15rus [73]

Answer:

Second hand will turn through 74π radians.

Step-by-step explanation:

There are 37 minutes left in the class. We need to find by how much angle will the second hand turn before the end of the class.

When a second hand completes one full rotation along the clock it covers 360 degrees and completes 60 seconds.

This means:

In 60 seconds, the second hand turns by 360 degrees

Since, 60 seconds = 1 minute, we can write:

In 1 minute, the second hand turns = 360 degrees

360 degrees is equal to 2π radians. So,

In 1 minute, the second hand turns = 2π radians

Multiplying both sides by 37 gives us:

In 37 minutes, the second turns = 2π radians x 37 = 74π radians

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3 years ago

1. Create a circle. Show and explain the difference between the following:

liberstina [14]

1.
a.
A secant line is a line which intersects the circle at 2 different points.

A tangent line is a line which has only one point in common with the circle.

Check picture 1: The orange line s is a secant line, the blue line t is a tangent line.

b.
An inscribed angle is an angle formed by using 3 points of a circle.

The main property of an inscribed angle is that its measure is half of the measure of the arc it intercepts.

Check picture 2: If $m(\angle KML)=\beta$ , then the measure of arc KL is $2 \beta$ .

A central angle is an angle whose vertex is the center of the circle, and the 2 endpoints of the rays are points of the circle.

The main property is: the measure of the central angle is equal to the measure of the arc it intercepts.

Check picture 2

2.
To construct the inscribed circle of a triangle, we first draw the 3 interior angle bisectors of the triangle.
They meet at a common point called the incenter, which is the center of the inscribed circle.
We open the compass, from the incenter, so that it touches one of the sides at only one point. We then draw the circle. (picture 3)

To draw the circumscribed circle, we first find the midpoints of each side. We then draw perpendicular segments through these (the midpoints.) They meet at one common point, which is the circumcenter: the center of the circumscribed circle.
We open the compass from the circumcenter to one of the vertices of the triangle. We draw the circle, and see that it circumscribes the triangle.

(picture 4)

3.

Given an equation of a circle: $x^2-2x+y^2+6y+6=0$ .

To determine the center and the radius of the equation we must write the above equation in the form :

$(x-a)^2+(y-b)^2=r^2$ .

Then, (a, b) is the center, and r is the radius of this circle. We do this process by completing the square.

Note that $x^2-2x$ becomes a perfect square by adding 1, and
$y^2+6y$ becomes a perfect square by adding 9.

Thus we have:

$x^2-2x+y^2+6y+6=0\\\\(x^2-2x+1)+(y^2+6y+9)-4=0\\\\(x-1)^2+(y+3)^2=2^2$

Thus, the center is (1, -3), and the radius is 2.

4. Not complete

5.

The radius of the pizza is $\displaystyle{ \frac{131}{2}ft=65.5ft$ .

The surface of a circle with radius r is given by the formula $\displaystyle{ A=\pi r^2$ ,
and the circumference is given by the formula C=2πr.

Thus, the area of the whole pizza is given by $\displaystyle{ A=\pi r^2= \pi\cdot65.5^2=4290.25 \pi$ (square ft).

Each of the 50 slices, has an area of $\displaystyle{ \frac{4290.25 \pi}{50} =85.805 \pi$ (square ft)

Notice that the perimeter (the crust) of a slice is made of 2 radii, and the arc-like part.
The arc is 1/50 of the circumference, so it is $\displaystyle{\frac{2 \pi r}{50} = \frac{2\cdot65.5\cdot \pi }{50}= 2.62 \pi$ .

So the perimeter of one slice is 65.5+65.5+2.62π=131+2.62π