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storchak [24]
2 years ago
11

Forty five men can construct a road 210m long in 60 days. What length would be constructed by 72 men in 50 days assuming that al

l work at the same rate?
Mathematics
1 answer:
blagie [28]2 years ago
7 0

Answer:

280m

Step-by-step explanation:

Work rate would be (210m)/(45people)(60days)=7/90 m/(people)(day)

7/90 m/(people)(day) * 72people * 50days =280m

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A data set includes data from 500 random tornadoes. The display from technology available below results from using the tornado l
lisov135 [29]

Answer:

The null and alternative hypothesis are:

H_0:\mu =2.6\\H_a:\mu >2.6

There is sufficient evidence to support the claim that the mean tornado length is greater than 2.6 miles

Step-by-step explanation:

Consider the provided information.

The claim that the mean tornado length is greater than 2.6 miles.

If there is no statistical significance in the test then it is know as the null which is denoted by H_0, otherwise it is known as alternative hypothesis which denoted by H_a.

Therefore, the required null and alternative hypothesis are:

H_0:\mu =2.6\\H_a:\mu >2.6

significance level α =0.05

From the given table the test statistic T=2.230166

P-value is 0.0131

0.0131<0.05

P value is less than the significance level, so reject the null hypothesis.

There is sufficient evidence to support the claim that the mean tornado length is greater than 2.6 miles

6 0
3 years ago
EXPAND THE POLONOMIAL <br><br> (5a+1/2b)^2 HELPPP ASAP
stepan [7]

Answer:

25a^{2}+5ab+\frac{b^{2} }{4}

Step-by-step explanation:

(5a+\frac{1}{2} b)^{2}

1. First, write out the expression without the square

(5a+\frac{1}{2} b)(5a+\frac{1}{2} b)

2. Then use foil to multiply:

5a*5a+5a*\frac{1}{2}b+\frac{1}{2}b*5a+\frac{1}{2}b*\frac{1}{2}b

=25a^{2}+5ab+\frac{b^{2} }{4}

3. That is your answer.

8 0
3 years ago
Can someone please help me?
zaharov [31]

Answer:

8000000000

Step-by-step explanation:

8 times 10^9 = 8000000000

4 0
1 year ago
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MATH WHIZZES, GET OVER HERE PLEASE!! I ACTUALLY NEED HELP ON THIS QUESTION!!! IT IS NOT A JOKE!!!
dimulka [17.4K]

Answer:

1130040

Step-by-step explanation:

so what your going to do is it sounds like 3 turns = 3 hours so 1 turn= 1 year so theres 8760 hours in a year so thats going to be 8760 turns now multiply thar by 129 and you get your awnser.

8 0
2 years ago
Read 2 more answers
If 20 chickens laid 120<br> eggs. At this rate, how<br> many eggs would 30<br> chicken lay?
svetoff [14.1K]

Answer:

180 eggs is the correct amount.

6 0
3 years ago
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