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3 years ago

4 times the difference of 4 and a number is 24

Mathematics

1 answer:

Len [333]3 years ago

6 0

Answer:

Step-by-step explanation:

Let "a number" = x

4(x - 4) = 24

Isolate the x. First, divide 4 from both sides

(4(x -4))/4 = (24)/4

x - 4 = 6

Add 4 to both sides

x - 4 (+4) = 6 (+4)

x = 6 + 4

x = 10

10 is your answer for "a number"

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3 years ago

From an industrial area 70 companies were selected at random and 45 of them were panning for expansion next year. Find 95% confi

Lana71 [14]

Answer:

Confidence limit = [52.8%, 75.2%]

Step-by-step explanation:

$P=\frac{45}{70}= 0.64$

$(1-P)=1-0.64=0.36$

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$P$ ± $z$ $\sqrt{\frac{P(1-P)}{n} }$

where the value $z$ will be taken from the z-table for 95% confidence interval

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From the z-table the value of $z$ corresponding to 0.0975 is 1.96

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$0.64$ ± $0.112$

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3 years ago

15 is 10 % of what number

Len [333]

15*10=150

15 is 10% of 150

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3 years ago