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topjm [15]
3 years ago
8

Identify the expression 3x + 9 =18 +2x A. 3x +9 B. 3x+9=18+2x C. 18+2x

Mathematics
1 answer:
galina1969 [7]3 years ago
6 0

Answer:

Your answer would be c 18=2x

Step-by-step explanation:

Because you done did 3x=9 which you now have to do the other end of the problem.

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he amount of time that a customer spends waiting at an airport check-in counter is a random variable with mean 8.3 minutes and s
sp2606 [1]

Complete question:

He amount of time that a customer spends waiting at an airport check-in counter is a random variable with mean 8.3 minutes and standard deviation 1.4 minutes. Suppose that a random sample of n equals 47 customers is observed. Find the probability that the average time waiting in line for these customers is

a) less than 8 minutes

b) between 8 and 9 minutes

c) less than 7.5 minutes

Answer:

a) 0.0708

b) 0.9291

c) 0.0000

Step-by-step explanation:

Given:

n = 47

u = 8.3 mins

s.d = 1.4 mins

a) Less than 8 minutes:

P(X

P(X' < 8) = P(Z< - 1.47)

Using the normal distribution table:

NORMSDIST(-1.47)

= 0.0708

b) between 8 and 9 minutes:

P(8< X' <9) =[\frac{8-8.3}{1.4/ \sqrt{47}}< \frac{X'-u}{s.d/ \sqrt{n}} < \frac{9-8.3}{1.4/ \sqrt{47}}]

= P(-1.47 <Z< 6.366)

= P( Z< 6.366) - P(Z< -1.47)

Using normal distribution table,

NORMSDIST(6.366)-NORMSDIST(-1.47)

0.9999 - 0.0708

= 0.9291

c) Less than 7.5 minutes:

P(X'<7.5) = P [Z< \frac{7.5-8.3}{1.4/ \sqrt{47}}]

P(X' < 7.5) = P(Z< -3.92)

NORMSDIST (-3.92)

= 0.0000

3 0
3 years ago
If you draw on card randomly from a standard 52-card playing deck, what is the probability that it will be a:
Sedbober [7]
I don’t understand the question but I like the letter c
5 0
2 years ago
A gas occupies 1.00 L at standard temperature. What is the volume at 606 K?
tino4ka555 [31]

Answer:

the volume at 606k is 2.22....the third one

Step-by-step explanation:

v1=1.00 t1=273 v2=? t2=606

v1/t1=v2/t2

1.00/273=v2/606

1.00×606=273v2

606=273v2

606/273=v2

2.21 L=v2

3 0
3 years ago
Solve for A. R = x(A + B) A = (R - B)/x A = (B - Rx)/x A = (R - Bx)/x
n200080 [17]
R = x(A + B)...distribute
R = Ax + Bx.....subtract Bx
R - Bx = Ax...divide both sides by x
(R - Bx) / x = A <==
4 0
3 years ago
Ill give brainlist and 5 stars!
Kamila [148]

Answer:

£24,301.55

Step-by-step explanation:

26705 decrease 9% =

26705 × (1 - 9%) = 26705 × (1 - 0.09) = 24301.55

6 0
3 years ago
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