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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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Step-by-step explanation:

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the one on top of 120 is 180-120 which is 60 so the one on the right of x is 180-(25+60) which is 95

now the value of x is 180-95 which is 85.

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for the first one x=85

the second one x=80

3 0
3 years ago
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A​ 9-year-old girl did a science fair experiment in which she tested professional touch therapists to see if they could sense he
Orlov [11]

Answer:

We conclude that the the touch therapists does not use a method equivalent to random guesses.

Yes, the results suggest that touch therapists are​ effective.

Step-by-step explanation:

We are given that in a 9-year-old girl did a science fair experiment in which she tested professional touch therapists to see if they could sense her energy field.

Among 264264 ​trials, the touch therapists were correct 105105 times.

<u><em>Let p = proportion that touch therapists uses a random guess method.</em></u>

Here, random guess means; p = 50%

So, Null Hypothesis, H_0 : p = 50%     {means that the touch therapists use a method equivalent to random guesses}

Alternate Hypothesis, H_A : p \neq 50%     {means that the touch therapists does not use a method equivalent to random guesses}

The test statistics that would be used here <u>One-sample z proportion statistics</u>;

                         T.S. =  \frac{\hat p-p}{\sqrt{\frac{\hat p(1-\hat p)}{n} } }  ~ N(0,1)

where, \hat p  = sample proportion of touch therapists were correct = \frac{105}{264} = 0.39

            n = sample of trials = 264

So, <em><u>test statistics</u></em>  =  \frac{\frac{105}{264} -0.50}{\sqrt{\frac{\frac{105}{264}(1-\frac{105}{264})}{264} } }  

                                =  -3.395

The value of z test statistics is -3.395.

<em>Now, at 0.05 significance level the z table gives critical value of -1.96 and 1.96 for two-tailed test. Since our test statistics does not lie within the range of critical values of z, so we have sufficient evidence to reject our null hypothesis as it will in the rejection region due to which </em><u><em>we reject our null hypothesis</em></u><em>.</em>

Therefore, we conclude that the the touch therapists does not use a method equivalent to random guesses.

Yes, the results suggest that touch therapists are​ effective.

3 0
3 years ago
Is root -2 a irrational number? plz explain
Bogdan [553]

Answer:

yes

Step-by-step explanation:

4 0
3 years ago
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Pls help on the circle ones and pls make sure they're right
MaRussiya [10]
X=252.........................................
7 0
3 years ago
The measure of the angle with "?" is what?
Sergeeva-Olga [200]

Answer:

? =  116°

Step-by-step explanation:

when a line passes through 2 parallel lines,

the angles ?° + 64° are complementary or add up to 180°

? + 64° = 180°

? = 180° - 64° = 116°

4 0
3 years ago
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