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3 years ago

What is three fourths plus four fifths minus seven tenths

Mathematics

2 answers:

alina1380 [7]3 years ago

6 0

Answer:

0.85

Step-by-step explanation:

lidiya [134]3 years ago

3 0

Answer:

17/20

Step-by-step explanation:

3/4 + 4/5 - 7/10

1. Find the LCD (Least Common Denominator). The LCD is 20.

2. 20/4=5. 5*3=15. So, 3/4 becomes 15/20.

3. 20/5=4. 4*4=16. So, 4/5 becomes 16/20.

4. 20/10=2. 2*7=14. So, 7/10 becomes 14/20.

5. Your new equation is 15/20 + 16/20 - 14/20.

6. Solve from left to right.

7. 15/20 + 16/20= 31/20.

8. 31/20 - 14/20= 17/20.

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Segment AB has endpoints A(-1,3) and B(0,7). What is the length of AB?

ololo11 [35]

Answer:

$\sqrt{17}$

Step-by-step explanation:

Calculate the length (d) using the distance formula

d = √ (x₂ - x₁ )² + (y₂ - y₁ )²

with (x₁, y₁ ) = (- 1, 3) and (x₂, y₂ ) = (0, 7)

d = $\sqrt{(0+1)^2+(7-3)^2}$

= $\sqrt{1^2+4^2}$

= $\sqrt{1+16}$

= $\sqrt{17}$ ≈ 4.1 ( to 1 dec. place )

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How many games did Lisa score less than 13 points?

Natali5045456 [20]

Answer:

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Step-by-step explanation:

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What is the answer to 11=x/-5 +8

Sladkaya [172]

To solve this problem, we must get the variable x alone on one side of the equation. To do this, first we must subtract 8 from both sides of the equation.

11=x/-5 + 8 = 19 = x/-5

Next, we must multiply both sides by -5, to cancel out the fraction term on the right side of the equation.

3 = x/-5 = -15=x

Therefore, x = -15, which is the solution to this equation.

Hope this helps!

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4 years ago

There are fifteen shirts in your closet ,eight blue and seven green. You randomly select one to wear on Monday and then a differ

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Answer:

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Step-by-step explanation:

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The Wall Street Journal reported that the age at first startup for 90% of entrepreneurs was 29 years of age or less and the age

Hitman42 [59]

Answer:

(a) $\hat p\sim N(0.90,\ 0.0212^{2}})$

(b) $\hat q\sim N(0.10,\ 0.0212^{2}})$

Step-by-step explanation:

The information provided is:

The age at first startup for 90% of entrepreneurs was 29 years of age or less.
The age at first startup for 10% of entrepreneurs was 30 years of age or more.

According to the Central limit theorem, if from an unknown population large samples of sizes n > 30, are selected and the sample proportion for each sample is computed then the sampling distribution of sample proportion follows a Normal distribution.

The mean of this sampling distribution of sample proportion is:

$\mu_{\hat p}=p$

The standard deviation of this sampling distribution of sample proportion is:

$\sigma_{\hat p}=\sqrt{\frac{p(1-p)}{n}}$

(a)

Let p represent the proportion of entrepreneurs whose first startup was at 29 years of age or less.

A sample of n = 200 entrepreneurs is selected.

As n = 200 > 30, according to the Central limit theorem the sampling distribution of sample proportion can be approximated by the normal distribution.

Compute the mean and standard deviation as follows:

$\mu_{\hat p}=p=0.90\\\\\sigma_{\hat p}=\sqrt{\frac{p(1-p)}{n}}=\sqrt{\frac{0.90(1-0.90)}{200}}=0.0212$

So, $\hat p\sim N(0.90,\ 0.0212^{2}})$ .

(b)

Let q represent the proportion of entrepreneurs whose first startup was at 30 years of age or more.

A sample of n = 200 entrepreneurs is selected.

As n = 200 > 30, according to the Central limit theorem the sampling distribution of sample proportion can be approximated by the normal distribution.

Compute the mean and standard deviation as follows:

$\mu_{\hat q}=q=0.10\\\\\sigma_{\hat q}=\sqrt{\frac{q(1-q)}{n}}=\sqrt{\frac{0.10(1-0.10)}{200}}=0.0212$

So, $\hat q\sim N(0.10,\ 0.0212^{2}})$ .

(c)

The standard deviation of sample proportions is also known as the standard error.

The standard deviation of p is, 0.0212.

The standard deviation of q is, 0.0212.

Thus, the standard errors of the sampling distributions in parts (a) and (b) are same.

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3 years ago