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Sonbull [250]
1 year ago
9

3 Michael has 6 dimes. He plans to give 5 dimes to his cousin. He can use the expression 6 -- 5 to find how many dimes he will h

ave left. Cross out integer chips to model 6 - 5.
Mathematics
1 answer:
il63 [147K]1 year ago
5 0

6-5 = 1

She will have left 1 dime.

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Five less than twice a number is seven
mart [117]

Answer:

2x - 5 = 7

2x -5 + 5 = 7 + 5

2x = 12

2/2x = 12/2

x = 6

Step-by-step explanation:

3 0
3 years ago
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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
3 years ago
Simplify (4x − 6) + (5x + 1)
Basile [38]
9x-5, I guess, not sure, but I'm combining like terms. Hope it's right.
5 0
3 years ago
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What is pi???????????????
Kipish [7]

Answer:

The ratio of a circle's circumference to its diameter

In other words: all the way around a circle divided by all the way across it.

The symbol is π (pi)

No matter how large or small the circle, its circumference is always π times its diameter.

π = 3.14159265358979323846... (the digits go on forever without repeating)

A rough approximation is 22/7 (=3.1428571...), but that is not accurate.

Step-by-step explanation:

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3 years ago
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Help please :]<br> 6x-2 = 8x+11
slavikrds [6]

Step-by-step explanation:

  • 6x-2=8x+11
  • 6x-8x=11+2
  • -2x=13
  • x=13/-2
  • x=-6.5
6 0
2 years ago
Read 2 more answers
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