2 years ago

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Mathematics

1 answer:

matrenka [14]2 years ago

4 0

So for 1 hour you pay 10 dolars then for 3 you pay 30 then for 11 you pay 110 then for 20 you pay 200.

For B and C I dont Know sorry.

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Hello, I need help solving the system of equations by substitution method.

mash [69]

4(-5y) + 2y = 180

-20y + 2y = 180

-18y = 180

y = -10
x = 50

5 0

3 years ago

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Use the normal distribution of SAT critical reading scores for which the mean is 502 and the standard deviation is 116. Assume t

PSYCHO15rus [73]

Answer:

(a) 93.19%

(b) 267.3

Step-by-step explanation:

The population mean and standard deviation are given as 502 and 116 respectively.

Consider, <em>X</em> be the random variable that shows the SAT critical reading score is normally distributed.

(a) The percent of the SAT verbal scores are less than 675 can be calculated as:

$P(X$

Thus, the required percentage is 93.19%

(b)

The number of SAT verbal scores that are expected to be greater than 575 can be calculated as:

$P(X>575)=P(\frac{x-502}{116}>\frac{575-502}{116}\\P(X>575)=P(Z>\frac{575-502}{116})\\P(X>575)=P(Z>0.6293)\\P(X>575)=0.2673$

So,

Out of 1000 randomly selected SAT verbal scores, 1000(0.2673) = 267.3 are expected to have greater than 575.

8 0

2 years ago

Solve these equation<br> 4(m+7)=44

Sphinxa [80]

4m+28=44
4m=44-28
4m=16
m=16/4
m=4

5 0

3 years ago

I need help quick please

dsp73

96 ! If you get x on one side and the # on the other you get x=96

4 0

3 years ago

find an equation for the nth term of the sequence. -3, -12, -48, -192, ... select one: a. an = 4 • -3n 1 b. an = -3 • 4n - 1 c.

Andrews [41]

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3 0

3 years ago

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