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4 years ago

A rectangular flower garden in Samantha's backyard has 140 feet around its edge. The width of the garden is 30 feet

Mathematics

1 answer:

ludmilkaskok [199]4 years ago

6 0

Step-by-step explanation:

Perimeter would be (Base + Length) × 2

$(140 + 30) \times 2 = 340$

Area would be Base × Length

$140 \times 30 = 4200$

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Y = 5/x<br> That happens to the value of y if the value of x triples?

Fofino [41]

Answer:

D. ÷ 3

Step-by-step explanation:

We can use any numbers for x to see what would happen to y:

If x was 5, y would be 1 (because 5 ÷ 5 = 1). Now, if we tripled x and made it 15 (5 × 3 = 15), y would be 1/3 (because 5 ÷ 15 = 1/3).

This means that the value of y divides by 3, option D

Hope this helps!

8 0

2 years ago

Read 2 more answers

Plsssss help due today !!! ill give brainliest

Grace [21]

Answer:

1.5

Step-by-step explanation:

We can set up the equation 0.50X = 0.750

Divide by 0.5 and we get .75/.5=1.5

4 0

3 years ago

Read 2 more answers

For this item, any answers that are not whole numbers should be entered as a decimal, rounded to the tenths place. Brian's schoo

LenaWriter [7]

Answer:

The probability that the locker code begins with a prime number is 40%.
The probability that the last digit of the locker code is an odd number is 40%

Step-by-step explanation:

Prime numbers are the numbers that only divide with 1 or itself. So in this case it is 5 and 7.

The possible combinations are

1*4*3 (with 5) + 1*4*3(with 7) = 24

Total combinations are 5*4*3=60

(24/60)*100 = 40 %

2. Odd numbers are those which don't divide with 2. So in this case it is 6 and 8.

The possible combinations are

1*4*3 (with 6) + 1*4*3(with 8) = 24

Total combinations are 5*4*3=60

(24/60)*100 = 40 %

3 0

3 years ago

A physical therapist wants to determine the difference in the proportion of men and women who participate in regular sustained p

Alekssandra [29.7K]

Using the z-distribution and the formula for the margin of error, it is found that:

a) A sample size of 54 is needed.

b) A sample size of 752 is needed.

In a sample with a number n of people surveyed with a probability of a success of $\pi$ , and a confidence level of $\alpha$ , we have the following confidence interval of proportions.

$\pi \pm z\sqrt{\frac{\pi(1-\pi)}{n}}$

In which z is the z-score that has a p-value of $\frac{1+\alpha}{2}$ .

The margin of error is of:

$M = z\sqrt{\frac{\pi(1-\pi)}{n}}$

90% confidence level, hence $\alpha = 0.9$ , z is the value of Z that has a p-value of $\frac{1+0.9}{2} = 0.95$ , so $z = 1.645$ .

Item a:

The estimate is $\pi = 0.213 - 0.195 = 0.018$ .

The sample size is <u>n for which M = 0.03</u>, hence:

$M = z\sqrt{\frac{\pi(1-\pi)}{n}}$

$0.03 = 1.645\sqrt{\frac{0.018(0.982)}{n}}$

$0.03\sqrt{n} = 1.645\sqrt{0.018(0.982)}$

$\sqrt{n} = \frac{1.645\sqrt{0.018(0.982)}}{0.03}$

$(\sqrt{n})^2 = \left(\frac{1.645\sqrt{0.018(0.982)}}{0.03}\right)^2$

$n = 53.1$

Rounding up, a sample size of 54 is needed.

Item b:

No prior estimate, hence $\pi = 0.05$

$M = z\sqrt{\frac{\pi(1-\pi)}{n}}$

$0.03 = 1.645\sqrt{\frac{0.5(0.5)}{n}}$

$0.03\sqrt{n} = 1.645\sqrt{0.5(0.5)}$

$\sqrt{n} = \frac{1.645\sqrt{0.5(0.5)}}{0.03}$

$(\sqrt{n})^2 = \left(\frac{1.645\sqrt{0.5(0.5)}}{0.03}\right)^2$

$n = 751.7$

Rounding up, a sample of 752 should be taken.

A similar problem is given at brainly.com/question/25694087

5 0

3 years ago

X + 7 > 2. what is the answerrrr

Sedaia [141]

Answer:

x>-5

Step-by-step explanation:

x+7-7>2-7

x>-5

hope this helps have a great day/night :)

6 0

3 years ago