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2 years ago

BRAINLIESTTT ASAP!!!!

Mathematics

1 answer:

azamat2 years ago

7 0

The first answer because domain means the x-values and it's a negative parabola 0 ≤ x ≤ 20

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Dion puts seven tenths of his allowance into savings each month what fraction of his saving doesnt go in

S_A_V [24]

Answer:

$\frac{3}{10}$ of his allowance doesn’t go into Dion’s savings.

Step-by-step explanation:

We know that $\frac{7}{10}$ of Dion’s savings is going into his savings.

Since the denominator is “10” we know that $\frac{10}{10}$ is the fraction that represents all of his allowance money.

So, we would subtract $\frac{7}{10}$ from $\frac{10}{10}$ .

$\frac{10}{10}$ - $\frac{7}{10}$ = $\frac{3}{10}$

5 0

2 years ago

The mean cost of domestic airfares in the United States rose to an all-time high of $385 per ticket (Bureau of Transportation St

saveliy_v [14]

Answer:

a)0.067

b)0.111

c)0.612

d)$687.28

Step-by-step explanation:

We are given the following information in the question:

Mean, μ = $385

Standard Deviation, σ = $110

We are given that the distribution of domestic airfares is a bell shaped distribution that is a normal distribution.

Formula:

$z_{score} = \displaystyle\frac{x-\mu}{\sigma}$

a) P(domestic airfare is $550 or more)

P(x > 550)

$P( x > 550) = P( z > \displaystyle\frac{550 - 385}{110}) = P(z > 1.5)$

$= 1 - P(z \leq 1.5)$

Calculation the value from standard normal z table, we have,

$P(x > 550) = 1 - 0.933 = 0.067= 6.7\%$

b) P(domestic airfare is $250 or less)

$P(x \leq 250) = P(z \leq \displaystyle\frac{250-385}{110}) = P(z \leq -1.22)$

Calculating the value from the standard normal table we have,

$P( x \leq 250) = 0.111 = 11.1\%$

c))P(domestic airfare is between $300 and $500)

$P(300 \leq x \leq 500) = P(\displaystyle\frac{300 - 385}{110} \leq z \leq \displaystyle\frac{500-385}{110}) = P(-0.77 \leq z \leq 1.04)\\\\= P(z \leq 1.04) - P(z < -0.77)\\= 0.851 - 0.239 = 0.612 = 61.2\%$

$P(300 \leq x \leq 500) = 61.2\%$

d) P(X=x) = 0.03

We have to find the value of x such that the probability is 0.03.

P(X > x)

$P( X > x) = P( z > \displaystyle\frac{x - 385}{110})=0.03$

$= 1 -P( z \leq \displaystyle\frac{x - 385}{110})=0.03$

$=P( z \leq \displaystyle\frac{x - 385}{110})=0.997$

Calculation the value from standard normal z table, we have,

$\displaystyle\frac{x - 385}{110} = 2.748\\x = 687.28$

Hence, the domestic fares must be $687.28 or greater for them to lie in the highest 3%.

7 0

2 years ago

NO FILES NO FILES PLZ ASAP I REALLY NEED HELP WITH THIS ALGEBRA QUESTION

frez [133]

Answer:

Step-by-step explanation:

4 0

2 years ago

The $199.99 digital camera Anne purchased was on sale for 15% off. What amount did Anne get off the price?

defon

29.99 dollars because if you use a calculator subtracting 1.99.99 by 15% you get 29.998 but you can also round up to 30$

8 0

3 years ago

Please help me with this

Zarrin [17]

The two end points of our line are (0,2.5) and (5,5.5). to find our slope we need to find our n difference (higher value - lower value) and our C difference (same as n) which would be 5 and 3. now we put our cost difference over our miles difference and get our slope (5/3). this means we still need out starting point. which is a cost of 2.5. the equation is C = (slope)5/3n + (starting value)2.5

7 0

2 years ago

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