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STatiana [176]
3 years ago
10

the denominator of a fraction is 3 less than the numerator. If 5 is added to the numerator and denominator, the result is 5/6. F

ind the sum of the numerator and denominator of the original fraction.
Mathematics
1 answer:
Vitek1552 [10]3 years ago
7 0
X=numerator
y=denominator
the sum of numerator and denominator=x+y
we suggest this system of equations:

y=x-3
(x+5) / (y+5)=5/6

we solve this system of equation by substitution method.
(x+5) / (x-3+5)=5/6
(x+5) / (x+2)=5/6
6(x+5)=5(x+2)
6x+30=5x+10
6x-5x=10-30
x=-20

y=x-3=-20-3=-23

Teh sum of the numerator an denominator=-20+(-23)=-43

Answer:    -43



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Volume of square pyramid can be calculated by the formula :

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In the given figure a= x in.and h = \frac{1}{4}  x in.

Volume of pyramid given V =486 cubic inches.

Substituting these values in volume of pyramid we have:

486= x^{2}  \frac{x}{4} ÷ 3

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A survey was conducted to measure the height of men. In the survey, respondents were grouped by age. In the 20-29 group the grou
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Answer:

(a) The probability that his height is less than 66 inches is 0.2743.

(b) The probability that the height is between 66 and 71 inches is 0.4679.

(c) The probability that the height is more than 71 inches is 0.2578.

Step-by-step explanation:

The data given in the question is:

Mean (μ) = 68.4

Standard Deviation (σ) = 4

Let X denote the height of men. We will use the normal distribution z-score formula to calculate the z-score and then look up the probability in the normal probability distribution table. The z-score formula is:

z = (X - μ)/σ

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The probability that his height is less than 66 inches is 0.2743.

(b) P(66<X<71)  = P(X<71) - P(X<66)

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P(z<0.65) = 0.7422

P(66<X<71)  = 0.7422 - 0.2743

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The probability that the height is between 66 and 71 inches is 0.4679.

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P(X>71) = 1 - P(X<71)

            = 1 - 0.7422

P(X>71) = 0.2578

The probability that the height is more than 71 inches is 0.2578.

3 0
3 years ago
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