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EleoNora [17]
2 years ago
13

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Use the net to find the surface area of the square pyramid

Mathematics
2 answers:
nydimaria [60]2 years ago
5 0

Answer:

333 ft^2

Step-by-step explanation:

Surface area is the sum of all the areas of the shape.

First, the area of the square in the center is simply 9x9 = 81.

The area of a triangle is (bh)/2, where b = base, and h = height

In the triangle, 9 is the base, and 14 is the height:

(9x14)/2 = 63

There are four triangles of the same area:

63 x 4 = 252

252 + 81 = 333

Rudik [331]2 years ago
4 0

Answer:

333ft^2

Step-by-step explanation:

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I need help asap!! i’ll give brainliest if right
iris [78.8K]

Answer:

D

Step-by-step explanation:

It is a positive corrolation

5 0
3 years ago
C=0.765+0.06(0.765x)
myrzilka [38]

i think the answer is (0.765+0.0459x)

4 0
3 years ago
Cedric's basketball team scored fewer than 76 points in their last game. Which of the following inequalities represents the numb
Lelechka [254]

Answer: n

Step-by-step explanation:

Although you did not provide the inequalities, the only inequality that can represent the number of points Cedric's basketball team scored in their last game is the one shown below:

Let's call the number of points Cedric's basketball team scored in their last game: n.

You know that Cedric's basketball team scored fewer than 76 points in their last game. "Fewer than" means "less than", which is represented with the symbol < .

Therefore, you can represent the number of points Cedric's basketball team scored in their last game with the following inequality:

n

8 0
3 years ago
Jordan fills several bags of oranges . This line plot shows the wait of each bag.
Alexandra [31]

Answer:  1 1/8 or 9/8

Step-by-step explanation:

5 1/2-4 3/8= 1/ 1/8

6 0
2 years ago
Consider the probability that at least 88 out of 158 software users will not call technical support. Assume the probability that
Nookie1986 [14]

Answer:

E(X) = 158*0.57 =90.06

And the standard deviation for the random variable is given by:

\sigma= \sqrt{158*0.57*(1-0.57)} = 6.223

And the distribution for the approximation is given by:

X \sim N (\mu = 90.06, \sigma = 6.223)

We can use the z score formula given by:

z = \frac{x -\mu}{\sigma}

And using the complement rule we got:

P(X \geq 88) = 1-P(X

And using the standard normal table we got:

P(X \geq 88) = 1-P(X

Step-by-step explanation:

Previous concepts  

The binomial distribution is a "DISCRETE probability distribution that summarizes the probability that a value will take one of two independent values under a given set of parameters. The assumptions for the binomial distribution are that there is only one outcome for each trial, each trial has the same probability of success, and each trial is mutually exclusive, or independent of each other".  

Solution to the problem

Let X the random variable of interest, on this case we now that:  

X \sim Bin (n = 158, p =0.57)

The probability mass function for the Binomial distribution is given as:  

P(X)=(nCx)(p)^x (1-p)^{n-x}  

Where (nCx) means combinatory and it's given by this formula:  

nCx=\frac{n!}{(n-x)! x!}  

We want this probability:

P(X\geq 88)

Normal approximation

We need to check if we can use the normal approximation , the conditions are:

np =158*0.57 = 90.06>10

n(1-p) = 158*(1-0.57) = 67.94>10

Since we satisfy both conditions the normal approximation makes sense

The expected value is given by this formula:

E(X) = 158*0.57 =90.06

And the standard deviation for the random variable is given by:

\sigma= \sqrt{158*0.57*(1-0.57)} = 6.223

And the distribution for the approximation is given by:

X \sim N (\mu = 90.06, \sigma = 6.223)

We can use the z score formula given by:

z = \frac{x -\mu}{\sigma}

And using the complement rule we got:

P(X \geq 88) = 1-P(X

And using the standard normal table we got:

P(X \geq 88) = 1-P(X

4 0
3 years ago
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