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3 years ago

It takes Salma 4 hours to plant a garden.

Mathematics

1 answer:

neonofarm [45]3 years ago

5 0

Answer:

it will take 1 hour

Step-by-step explanation:

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The sum of two numbers is 63. The larger number is 23 more than the smaller number. What are the numbers?

Sunny_sXe [5.5K]

x+y=63

x=y+23

y+23+y =63

2y +23 = 63

2y =40

y=40/2 =20

y = 20

x = 20+23=43

the numbers are 20 & 43

5 0

3 years ago

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Grade geo<br> Practice 7.3

TiliK225 [7]

Answer:

Nice to hear that, congrats with practice 7.3

4 0

3 years ago

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A teacher was interested in knowing the amount of physical activity that his students were engaged in daily. He randomly sampled

klasskru [66]

Answer:

The standard error of the mean is 4.5.

Step-by-step explanation:

As we don't know the standard deviation of the population, we can estimate the standard error of the mean from the standard deviation of the sample as:

$\sigma_{\bar{x}}\approx\frac{s}{\sqrt{n}}$

The sample is [30mins, 40 mins, 60 mins, 80 mins, 20 mins, 85 mins]. The size of the sample is n=6.

The mean of the sample is:

$\bar{x}=\frac{1}n} \sum x_i =\frac{30+40+60+80+20+85}{6}=52.5$

The standard deviation of the sample is calculated as:

$s=\sqrt{\frac{1}{n-1}\sum (x_i-\bar x)^2} \\\\ s=\sqrt{\frac{1}{5}\cdot ((30-52.5)^2+(40-52.5)^2+(60-52.5)^2+(80-52.5)^2+(20-52.5)^2+(85-52.5)^2}\\\\s=\sqrt{\frac{1}{5} *3587.5}=\sqrt{717.5}=26.8$

Then, we can calculate the standard error of the mean as:

$\sigma_{\bar{x}}\approx\frac{s}{\sqrt{n}}=\frac{26.8}{6}= 4.5$

6 0

3 years ago

HELP ASAP WILL GIVE BRAINLEST

blondinia [14]

Answer: d-9

Step-by-step explanation: d equals the savings so it says she spent four dollars and then five, so just add those and subtract it from the savings

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3 years ago

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Find the value of 7x^2+2x when x=3

frozen [14]

Answer:

Step-by-step explanation:

so x2 will give you 9 times 7 which is 63. add it to 2 times 3 which is 63 + 6 will give you 69.

8 0

3 years ago