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ehidna [41]
2 years ago
12

Nelson covered the first 20 miles in 2 1/2 hours. What was his average speed in miles per hour?

Mathematics
1 answer:
klio [65]2 years ago
8 0

Answer:

= 8 mp /h

Step-by-step explanation:

Average speed=total distance/total time

=20/2.5

=8 mp/h

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What are the coordinates of the point on the directed line segment from (-4,1) to (1,6) that partitions the segment into a ratio
Aleksandr [31]

Answer:

a segment is partitioned at a ratio of 1:3, then the point is one-fourth of the distance from (-4,-1) to (2,7).

To compute the x-coordinate of that point, you will need to compute one-fourth of the x-distance between 2 and -4 then add it to -4: (2--4)/4 = 1.5; 1.5 + -4 = -2.5.

To compute the y-coordinate of that point, you will need to compute one-fourth of the y-distance between 7 and -1 then add it to -1: (7--1)/4 = 2; 2 + -1 = 1.

The point is (-2.5,1)

3 0
2 years ago
The half-life of lead is 22 years. How long will it take for a sample of this substance t decay to 80% of its original amount?
Svetlanka [38]

Answer: 7 years

Step-by-step explanation:

t_{\frac{1}{2} } = In2 / ∧

since the half life is given , we have :

22 = In 2/ ∧

∧ = In2/22

∧ = 0.032

Recall the formula for half life:

\frac{N(t)}{N(0)} = e^{-∧t}

Therefore:

0.80 = e^{-0.032t}

Take the In of both sides

In 0.80 = - 0.032t

t = In 0.80 / - 0.032

t = 7 years

4 0
3 years ago
Barnard’s Star is approximately 35,133 billion miles from Earth. What is 35,133 billion in scientific notation?
julsineya [31]
C


Mark brainliest please


Hope this helps you
4 0
2 years ago
5/6(1/2(12)+6)-3(12)
zimovet [89]

Answer:

-26

Step-by-step explanation:

3 0
3 years ago
Read 2 more answers
The equations of two functions are y =-28x + 8 and y=-29x + 7. Which function is changing more
irinina [24]

<u>Answer:</u>

y=-29x+7 is changing more quickly.

<u>Step-by-step explanation:</u>

This is because the equation y=-29x+7 has a larger slope. The speed of change is determined entirely by the slope; the larger the slope, the faster the line goes up or down. It doesn't matter if it's negative or positive. -29 is the slope of the equation.

<em>Please mark Brainliest.</em>

4 0
2 years ago
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