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3 years ago

What is the Surface area of a square pyramid if

Mathematics

1 answer:

Tatiana [17]3 years ago

3 0

SA= 108 m^2 aND the formula for surface area is SA=2bs+b^2

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To find the sale price of an item you have to add the original price plus the discount amount

Orlov [11]

Answer:

True

Step-by-step explanation:

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3 years ago

Factor 16x4 - 4y2<br><br> A) (x + 4y)(x - 4y)<br> B) 4(2x2 + y)(2x2 - y)

Alex73 [517]

Step-by-step explanation:

$16 {x}^{4} - 4 {y}^{2} \\ {4}^{2} {x}^{4} - {2}^{2} {y}^{2} \\ {4}^{2} {x}^{2} \times {x}^{2} - {2}^{2} {y}^{2} \\ (4 {x}^{2} - 2y)(4 {x}^{2} - 2y)$

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3 years ago

Read 2 more answers

35. In a simple random sample of 25 high school students, the sample mean of the SAT scores was 1450, and the sample variance wa

Tatiana [17]

Answer:

$1450-2.0\frac{30}{\sqrt{25}}=1450-12$

$1450+2.0\frac{30}{\sqrt{25}}=1450+12$

And the best option would be:

c. 1450 +/- 12

Step-by-step explanation:

Information provided

$\bar X=1450$ represent the sample mean for the SAT scores

$\mu$ population mean (variable of interest)

$s^2 = 900$ represent the sample variance given

n=25 represent the sample size

Solution

The confidence interval for the true mean is given by :

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

The sample deviation would be $s=\sqrt{900}= 30$

The degrees of freedom are given by:

$df=n-1=2-25=24$

The Confidence is 0.954 or 95.4%, the value of $\alpha=0.046$ and $\alpha/2 =0.023$ , assuming that we can use the normal distribution in order to find the quantile the critical value would be $z_{\alpha/2} \approx 2.0$

The confidence interval would be

$1450-2.0\frac{30}{\sqrt{25}}=1450-12$

$1450+2.0\frac{30}{\sqrt{25}}=1450+12$

And the best option would be:

c. 1450 +/- 12

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3 years ago

Alex Ar [27]

Answer:

ADB and ABC are similar

x = 8

Step-by-step explanation:

hypotenuse in ADB = $\sqrt{4^2 + 2^2 } = \sqrt{20}$

since two triangles are similar,

$\frac{2+x}{\sqrt{20} } = \frac{\sqrt{20}}{2}$

solving for x, x=8

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3 years ago

An athlete earns $350,000 each year. If his team makes the play-offs, he will earn a 15% bonus. What will be his total earnings

Andrews [41]

He will earn $402,500 $350,000 plus a 15% bonus of $52,500

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3 years ago