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kupik [55]
3 years ago
14

Althea’s family decided to attend the yearly sailing festival in their town. This year the boat races will include both rowing a

nd sailing craft. Althea was excited about watching the racing events, as well as participating in the activities and seeing the informational booths for children.
1. Althea saw different types of sailboats on the water. She noticed that while each sailboat had triangular sails, different types of boats had different sizes and different numbers of sails. Here are two of the sailboats she saw:
Mathematics
1 answer:
MariettaO [177]3 years ago
8 0

Answer:

(a)

Area= 27ft^2 --- the catboat

Area = 25ft --- the sloop

(b)

Cost = \$40.5 -- the catboat

Cost = \$37.5 --- the sloop

Step-by-step explanation:

Incomplete question (See attachment)

For the catboat, we have:

Base = 9ft\\Height = 6ft

For the Sloop, we have:

Base = 7 + 3 = 10ft

Height = 5ft

Solving (a): The area of both sailboats.

Since both are triangular, we use:

Area= 0.5 * Base * Height

For the catboat

Area= 0.5 * 9ft*6ft

Area= 27ft^2

For the sloop

Area = 0.5 * 10ft * 5ft

Area = 25ft

<em>The catboat has the greater sail area because 27 > 25</em>

Solving (b): Cost of sail for each.

We have the unit price to be:

Unit = \$1.50/ft^2

So, the cost is calculated by multiplying the unit price by the total area.

So, we have:

For the catboat;

Cost = 27ft^2 * \$1.50/ft^2

Cost = \$40.5

For the sloop

Cost = 25ft^2 * \$1.50/ft^2

Cost = \$37.5

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What is the hyperbola 25x^2-100y-9y^2-90x-350=0 in standard form?
sergij07 [2.7K]
WE need to complete the square on the x and y terms:-

25x^2 - 100x - 9y^2 - 90y = 350
25(x^2 - 4x +    ) - 9(y^2 + 10x       )  =   350 + 25(  )  - 9(  )
25(x^2 - 4x  + 4 ) - 9(y^2 + 10x  + 25)  = 350  + 25(4)  - 9(25)
25(x - 2)^2 - 9(y + 5)^2 = 

25(x - 2)^2   -  9(y + 5)^2          =  225
----------------    --------------            --------
    225                 225                    225

  ( x  - 2)^2         (y + 5)^2  
  -------------   -   --------------  =    1         Answer
        9                    25                               



4 0
3 years ago
Under average driving conditions, the life lengths of automobile tires of a certain brand are found to follow an exponential dis
wariber [46]

Answer:

a) P(X>30000)=1-( 1- e^{-\frac{30000}{30000}})=e^{-1}=0.368

b) P(X>30000|X>15000)=P(X>15000)=1-( 1- e^{-\frac{15000}{30000}})=e^{-0.5}=0.607

Step-by-step explanation:

Previous concepts

The exponential distribution is "the probability distribution of the time between events in a Poisson process (a process in which events occur continuously and independently at a constant average rate). It is a particular case of the gamma distribution". The probability density function is given by:

P(X=x)=\lambda e^{-\lambda x}, x>0

And 0 for other case. Let X the random variable that represent "life lengths of automobile tires of a certain brand" and we know that the distribution is given by:

X \sim Exp(\lambda=\frac{1}{30000})

The cumulative distribution function is given by:

F(X) = 1- e^{-\frac{x}{\mu}}

Part a

We want to find this probability:

P(X>30000) and for this case we can use the cumulative distribution function to find it like this:

P(X>30000)=1-( 1- e^{-\frac{30000}{30000}})=e^{-1}=0.368

Part b

For this case w want to find this probability

P(X>30000|X>15000)

We have an important property on the exponential distribution called "Memoryless" property and says this:

P(X>a+t| X>t)=P(X>a)  

On this case if we use this property we have this:P(X>30000|X>15000)=P(X>15000+15000|X>15000)=P(X>15000)

We can use the definition of the density function and find this probability:

P(X>15000)=1-( 1- e^{-\frac{15000}{30000}})=e^{-0.5}=0.607

7 0
3 years ago
Please help meh plss
iragen [17]

Answer:

A, B

Step-by-step explanation:

Point C is greater than point B is correct, point C lies at 1.5.

1.5 is greater than 0.

Point B is less than 1 is correct, point B lies at 0.

0 is less than 1.

4 0
3 years ago
You want to carpet a 15 foot by 20 foot room. You have two carpet options to choose from. One is $1.50 per square foot and the o
Sauron [17]

Answer:

the answer is A because the cost of the more expensive one is 15+20=35 multiplied by 3 which will give me =$105

And the cheaper one is 15+20=35 multiplied by 1.50 = which is 52.5

so the amount more of the choice for the more expensive one is 105-52.5=52.5.

the answer is 52.50.

8 0
3 years ago
Casie’s track coach asks her to run 3 and 1/3 miles. If she only runs 1/2 of that distance, how far does she run? Pls help me, t
hammer [34]

Either one of these will work.

8 0
3 years ago
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