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Margarita [4]
2 years ago
11

Sam takes 1/3 hour to walk 1 km. he walks at the same rate. how many km will he walk in 4/5 of an hour

Mathematics
2 answers:
chubhunter [2.5K]2 years ago
8 0
Speed of Sam = Distance / Time
Here, Distance = 1 Km
Time = 1/3 hour

Substitute the values, in the formula:
Speed = 1 / 1/3 = 3 Km/h

Now, In next situation, Speed = 3 Km/h
& Time = 4/5 hour.

Substitute the values, in the same formula:
Distance = Speed × Time
D = 3 * 4/5
D = 12/5 = 2.4 Km

In short, Final answer of your question would be 2.4 Km

Hope this helps!
shepuryov [24]2 years ago
5 0
1\3 × 5 = 5\15 km per hour
4\5 × 3 = 12\15 km
He will walk 2.4 km in 4\5ths of an hour
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2 years ago
About 16 % of the population of a large country is allergic to pollen. If two people are randomly selected, what is the probabil
Vinvika [58]

Answer:

(a) 0.0256

(b) 0.2944

Step-by-step explanation:

For solving this exercise we can apply the binomial distribution. The equation that give as the probability is:

P(x,n,p)=(nCx)*p^{x} *(1-p)^{n-x}

Where n is the number of identical events, p is the probability that the event has a success and x is the number of success in the n identical events.

Additionally, nCx is calculated as:

nCx=\frac{n!}{x!(n-x)!}

So, in this case we have 2 identical events because we are going to select two people randomly and the probability p of success is the probability that the person is allergic to pollen and this probability is 16%.

Then, for the first case, x is 2 because their are asking for the probability that both are allergic to pollen. Replacing the values of x, n and p we get:

P(2,2,0.16)=(2C2)*0.16^{2} *(1-0.16)^{2-2}

P(2,2,0.16)=0.0256

For the second case, their are asking for the probability that at least one is allergic to pollen, that means that we need to sum the probability that both are allergic to pollen with the probability that just one is allergic to pollen.

Using the same equation to calculate P(1,2,0.16) we get:

P(1,2,0.16)=(2C1)*0.16^{1} *(1-0.16)^{2-1}

P(1,2,0.16)=0.2688

So, the probability that at least one person is allergic to pollen is 0.2944 and it is calculated as:

0.0256 + 0.2688 = 0.2944

7 0
3 years ago
What does 10^2-2(10+5) equal
Nookie1986 [14]

Answer:70

Step-by-step explanation:

10^2 =100

-2(10+15) = -2(15)=-30

100-30= 70

4 0
2 years ago
What is the square root of 1 2/5 ?
Oksi-84 [34.3K]

Answer:

Square root of 1 is 1

Square root of 2 is 1.41421356237 so 1.41

square root of 3 is 1.73205080757 so 1.73

Step-by-step explanation:

5 0
3 years ago
Suppose f is a function. If 10 = f(-4), find the coordinates of a point on the graph of f?
Rashid [163]

Given:

For a function f, 10 = f(-4).

To find:

The coordinates of a point on the graph of f.

Solution:

We have,

10 = f(-4)

It means the value of function f is 10 at -4.

On a coordinate plane x-axis represents the input values and y-axis represents the output values of a function. So,

x-coordinate = input value = -4

y-coordinate = output value = 10

Therefore, the required coordinates of a point on the graph of f are (-4,10).

5 0
3 years ago
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