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SSSSS [86.1K]
3 years ago
7

Which of the following best represents the average speed of a fast runner?

Mathematics
2 answers:
Troyanec [42]3 years ago
8 0

the one above is incorrect the real answer is 10 meters per second and you don't really need an equation for this (it's pretty obvious ) :)

Tpy6a [65]3 years ago
3 0
For the answer to the question above, the easiest way to determine is changing every runner's speed into the same unit.

<span>First = 10 m/s </span>

<span>Second = 10 miles/min = 16090.34 / 60 m/s (As 1 mile = 1609.34 meter and 1 min = 60 sec) </span>
<span>Second = 260.82 m/s </span>

<span>Third = 10 cm/hr = 10*(0.01)/60*60 (As 1 cm = 0.01 m and 1 hr = 60*60 sec) </span>
<span>Third = 0.000028 m/s </span>

<span>Fourth = 10 km/sec = 10*1000 m/s (As 1 km = 1000 m and time is already in sec) </span>
<span>Fourth = 10000 m/s </span>

<span>So fastest would be the one who covers the largest distance in 1 sec. It would be the fourth one.</span>
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I need help asap :):):)
KiRa [710]

Answer:

24 ÷ 4

Step-by-step explanation:

Putting something into fourths is putting into 4 parts. If you divide 24 by 4 you get 6. 6 equals 1/4 of 24. To check your work add 6 together 4 times.

7 0
3 years ago
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Which ordered pair satisfies the system of equations shown below? (10 POINTS + BRAINLIEST ANSWER)
nasty-shy [4]
The answer would be D.
 you would start by choosing one of the variables to eliminate, i chose to eliminate X first. in order to eliminate X, i had to multiply the second equation by -2. X then cancelled out, and i solved for the Y the same way you would a 1 step equation. Y=-4
I then took the first original equations, plugged Y in, and solved for X. X=3.

Hope this helps!
7 0
3 years ago
Write a word problem using rational numbers and using at least two of the operations (add, subtract, multiply, divide).
Lelu [443]

Alicia had - $11.00 in her checking account. She did a few chores and made $44.50. She decided to pay for her and a friend to go to the movies and each ticket costs $6.25. How much money does she have left in her account?

There are 30 students in Mrs.

Woodward’s class and 15 of the class has their own cell phone. Of this group of students, 12 of them

are allowed to use social media. How many of the students have a cell phone and can use social media?

There are two up there

7 0
3 years ago
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A see-saw is 25 feet long with a fulcrum in the middle of the board. If a 60 lb. child sits three feet from the fulcrum, what is
My name is Ann [436]

Answer:

14.4 lb

Step-by-step explanation:

In a see-saw in equilibrium, the torque generated by one side needs to be the same generated in the other side. The torque is calculated by the product between the mass and the distance to the center of the see-saw.

The torque generated by the child is:

T1 = 60 * 3 = 180 lb*feet

So, the torque generated by the weight needs to be higher than T1 in order to lift the child.

The lowest mass is calculated when the mass is in the maximum distance, that is, 12.5 feet from the center.

So, we have that:

T2 = 180 = mass * 12.5

mass = 180/12.5 = 14.4 lb

So the lowest weight is 14.4 lb

4 0
4 years ago
Determine if the function f(x) = 4√x − 3x satisfies the Mean Value Theorem on [4, 49]. If so, find all numbers c on the interval
Vedmedyk [2.9K]

Answer:

c

Step-by-step explanation:

The mean value theorem states that for a continuous and differentiable function on a interval there exists a number c from that interval, that

f'(c)=(f(b)-f(a))/(b-a)

First we must determine the endpoints:

f(49)=-119

f(4)=-4

We find the derivative of the function, f'(c)

f'(c)=3+2\sqrt{c}

Therefore:

3+2\sqrt{c}=((-119)-(-4))/((49)-(4))

Simplify:

3+2\sqrt{c}=-23/9

c=81/4

7 0
3 years ago
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