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3 years ago

Please help out will give brainliest

Mathematics

2 answers:

Leno4ka [110]3 years ago

5 0

Answer:

66 cm

Step-by-step explanation:

Evgesh-ka [11]3 years ago

4 0

Answer:

∠ A ≈ 77.8°

Step-by-step explanation:

Using the Sine rule in Δ ABC

$\frac{BC}{sinA}$ = $\frac{AB}{sinC}$

$\frac{37}{sinA}$ = $\frac{29}{sin50}$ ( cross- multiply )

29 × sinA = 37 × sin50° ( divide both sides by 29 )

sinA = $\frac{37sin50}{29}$ , then

A = $sin^{-1}$ ( $\frac{37sin50}{29}$ ) ≈ 77.8° ( to 1 dec. place )

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Okay so, i need help with this. It’s really important and I need to finish this paper before school tomorrow. Please help i will

SOVA2 [1]

Answer:

5x^2 - 4x - 3 = 0

Step-by-step explanation:

For the equation

ax^2 + bx + c = 0

the roots are [-b +/- √(b^2 - 4ac)] / 2a

So comparing the terms to the values in the question:

a = 5

b = -4

c = -3

7 0

1 year ago

Explanation A random sample of 100 observations from a normally distributed population possesses a mean equal to 83.2 and a stan

Olenka [21]

Answer:

The 95% confidence interval would be given by (81.933;84.467)

Step-by-step explanation:

1) Previous concepts

A confidence interval is "a range of values that’s likely to include a population value with a certain degree of confidence. It is often expressed a % whereby a population means lies between an upper and lower interval".

The margin of error is the range of values below and above the sample statistic in a confidence interval.

Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".

$\bar X=83.2$ represent the sample mean

$\mu$ population mean (variable of interest)

s=6.4 represent the sample standard deviation

n=100 represent the sample size

Confidence interval

The confidence interval for the mean is given by the following formula:

$\bar X \pm t_{\alpha/2}\frac{s}{\sqrt{n}}$ (1)

In order to calculate the critical value $t_{\alpha/2}$ we need to find first the degrees of freedom, given by:

$df=n-1=100-1=99$

Since the Confidence is 0.95 or 95%, the value of $\alpha=0.05$ and $\alpha/2 =0.025$ , and we can use excel, a calculator or a table to find the critical value. The excel command would be: "=-T.INV(0.025,99)".And we see that $t_{\alpha/2}=1.98$

Now we have everything in order to replace into formula (1):

$83.2-1.98\frac{6.4}{\sqrt{100}}=81.933$

$83.2+1.98\frac{6.4}{\sqrt{100}}=84.467$

So on this case the 95% confidence interval would be given by (81.933;84.467)

7 0

3 years ago

Can someone help? ?!?!?!????!?!

Mariulka [41]

I think it is C but im not too sure, wait for another answer that has more facts behind it.

6 0

3 years ago

How many solutions are there to the equation below? |x| = -31

ella [17]

Break down the problem into these two equations;

x = -31

-x = -31

Solve for the 1st equation; x = -31

x = -31

Solve for the 2nd equation; -x = -31

x = 31

Collect all solutions

x = ±31

Check the solution

When x = -31, the original equation; |x| = -31 does not hold true. Thus, we will drop x = -31 from the solution set.

Check the solution again;

When x = 31, the original equation |x| = -31 does not hold true as well. Thus we will drop x = 31 from the solution set.

Therefore,

<u>No solution exists to this equation. </u>

5 0

3 years ago

Read 2 more answers

A principle of $2000 is placed ina saving account at 3% APR compounded annually. How much is in the account after one year, two

Kisachek [45]

Answer:

1 year: $2060

2 years: $2121.80

3 years: $2185.45

Step-by-step explanation:

Compound interest formula is A = P(1 + $\frac{r}{n}^{nt$ ) where A is the final amount, P is the initial principal balance, r is the interest rate, n is the number of times interest applied per time period, and t is the number of time periods elapsed. In our case, P would be equal to 2000 dollars, r would be equal to 0.03, for 3 percent, and our n value would just be one, so the final equation is:

$2000(1.03)^t$

First, let's evaluate t for 1, as in one year.

$2000 * 1.03^1$ = 2000 x 1.03 = 2060

Two years: 2000 * 1.03 squared = 2121.80

Three years: 2000 * 1.03^3 = 2185.45!

Hope this helps!

8 0

2 years ago