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3 years ago

First, rewrite 7/9 and 16/21 so that they have a common denominator.

Mathematics

1 answer:

sattari [20]3 years ago

5 0

49/63 and 48/63..........

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Use the expression - 8( - 2.5-7).

Paladinen [302]

Answer:

20+56 or basically 76

Step-by-step explanation:

Just multiply -8 to -2.5 and -7.

6 0

3 years ago

Rebecca is calculating her expected expenses for her week long trip to Thailand. Her plane ticket costs 22,885 baht, her lodging

saul85 [17]

Answer:

The answer is B because you add up the 3 expenses

Step-by-step explanation:

Add the three expenses

7 0

2 years ago

abraham has 16 blue marbles and 18 rwd marbles. if he wamts to place them in identical groups without any marbles left over

VladimirAG [237]

Answer:

If Abraham divides them into 2 separate groups, he should have 17 marbles on each group.

Step-by-step explanation:

8 0

3 years ago

A random sample of 25 glass sheets is obtained and their thicknesses are measured. The sample mean is x= 3.54 mm and sample stan

lisabon 2012 [21]

Answer: (3.46, 3.62)

Step-by-step explanation:

The formula to find the confidence interval for population mean is given :-

$\overline{x}\ \pm\ t_{\alpha/2}\dfrac{s}{\sqrt{n}}$

, where n = sample size.

$t_{\alpha/2}$ = Two-tailed t-value for significance level of $(\alpha)$ and degree of freedom df= n-1.

$s$ = sample standard deviation.

As per given , we have

$\overline{x}= 3.54$ mm

s= 0.20 mm

n= 25

Significance level $=\alpha=1-0.95=0.05$

Since population standard deviation is not given , it means the given problem has t- distribution.

Two-tailed t-value for significance level of $(0.05)$ and degree of freedom df= 24:

$t_{\alpha/2\ ,df}=t_{0.025,\ 24}=2.0639$

95% Confidence interval for population mean:

$3.54\ \pm\ (2.0639)\dfrac{0.20}{\sqrt{25}}$

$=3.54\ \pm\ (2.0639)\dfrac{0.20}{5}$

$=3.54\ \pm\ (2.0639)(0.04)$

$=3.54\ \pm\ 0.082556$

$=(3.54- 0.082556,\ 3.54+ 0.082556 )=(3.457444,\ 3.622556)\approx(3.46,\ 3.62)$

Hence, the 95% two-sided confidence interval for the mean glass thickness = (3.46, 3.62)

7 0

4 years ago

A radio set was sold for 570 at a loss of 25 percent on the cost price find the cost price

Helga [31]

Answer:

712.50 is the cost price.

Step-by-step explanation:

570 increase 25% =

570 × (1 + 25%) = 570 × (1 + 0.25) = 712.5

7 0

2 years ago