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blondinia [14]
3 years ago
8

Marian can weed a garden in 3 hrs. Robin can weed the same garden in 4 hrs. If they work together, how long will the weeding tak

e them?
Mathematics
1 answer:
irina1246 [14]3 years ago
8 0

Answer:

The answer would be 12

Step-by-step explanation:

because all u have to do is multiply

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Solve the system x + y = 12 and x - y = 2
SOVA2 [1]

Answer:

answer is d

hope it helps

plz mark as brainliest

Step-by-step explanation:

7,5

8,6

9,7

5 0
3 years ago
If the water level in a lake drops by 14 feet, the water level will still be higher than the 20-foot mark that triggers restrict
maria [59]

Answer:

A is correct

Step-by-step explanation:

Here, we want to write an inequality

If the water level drops by 14 feet

what this mean is that we are subtracting 14 from the original level L

Thus, we have

L-14

Higher than 20 means that we have;

L-14 > 20

L > 20 + 14

L > 34

8 0
2 years ago
Remember to simplify your fraction***
romanna [79]

Answer:

1. 2/6 or 1/3

2.  4/6 or 2/3

3. 3/6 or 1/2

Step-by-step explanation:

I hope this helps I did the ones I knew

5 0
2 years ago
Read 2 more answers
An exponential random variable has a standard deviation of 16. Calculate The probability that it takes on a value < 11. Use 3
antiseptic1488 [7]

Answer:

P(X

And using the cdf we got:

P(X

Step-by-step explanation:

Previous concepts

The exponential distribution is "the probability distribution of the time between events in a Poisson process (a process in which events occur continuously and independently at a constant average rate). It is a particular case of the gamma distribution". The probability density function is given by:

P(X=x)=\lambda e^{-\lambda x}, x>0

And 0 for other case. Let X the random variable that represent the random variable of interest and we know that the distribution is given by:

X \sim Exp(\lambda)

We know the variance on this case given by :

Var(X) = \frac{1}{\lambda^2}

So then the deviation is given by:

Sd(X) = \frac{1}{\sqrt{\lambda}}

And if we solve for \lambda we got:

\lambda = (\frac{1}{16})^2 = \frac{1}{256}

The cumulative distribution function for the exponential distribution is given by:

F(x) = 1- e^{-\lambda x}

Solution to the problem

And for this case we want to find this probability:

P(X

And using the cdf we got:

P(X

5 0
3 years ago
Use pie= 22/7 to approximate the circumference of a circle whose diameter is 28 inches.​
Nata [24]

Answer:

88 inches

Step-by-step explanation:

formula for circumference: 2pir or pi*diameter

22/7*28=88

88 inches

7 0
2 years ago
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