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Ganezh [65]
3 years ago
8

If 3/x= 4/5, then what is the value of x? A. 12/5 B. 1/5 C. 15/4 D. 19/5 E.3

Mathematics
1 answer:
gladu [14]3 years ago
7 0

Answer:

C

Step-by-step explanation:

\frac{3}{x}=\frac{4}{5}\\

Cross multiply,

3*5 = 4*x

15 = 4x

4x = 15            {Divide both sides by 4}

x=\frac{15}{4}\\\\

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3 0
3 years ago
Why is it that when comparing a squares area with a rectangles area, with the SAME PERIMETER, that the square has a greater area
julsineya [31]

Answer:

When finding for the area of a square ,the lenght will be squared automatically leading to a greater value which is greater that of the rectangle which is length multipled by Width

8 0
3 years ago
A semi circle has a radius 8.2 cm
zaharov [31]

Answer:

Step-by-step explanation:

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5 0
3 years ago
Read 2 more answers
Assume that different groups of couples use the XSORT method of gender selection and each couple gives birth to one baby. The XS
olganol [36]

Answer:

Mean and Standard deviation for the numbers of girls in groups of 36 births are 18 and 3 respectively.

Step-by-step explanation:

We are given that he X SORT method is designed to increase the likelihood that a baby will be a girl, but assume that the method has no effect, so the probability of a girl is 0.5.

Now consider a group consisting of 36 couples.

The above situation can be represented through binomial distribution;

P(X=r)=\binom{n}{r} \times p^{r} \times (1-p)^{n-r} ;x=0,1,2,3,.....

where, n = number of trials (samples) taken = 36 couples

            r = number of success

            p = probability of success which in our question is probability

                   of a girl, i.e.; p = 0.5

<em><u>Let X = Numbers of girls in groups of 36 births </u></em>

So, X ~ Binom(n = 36, p = 0.5)

Now, mean for the numbers of girls in groups of 36 births is given by;

         <u>Mean</u>, E(X) = n \times p = 36 \times 0.5 = 18

Also, standard deviation for the numbers of girls in groups of 36 births is given by;

        <u>Standard deviation</u>, S.D.(X) =  \sqrt{n\times p\times (1-p)}

                                                      =  \sqrt{36\times 0.5\times (1-0.5)}

                                                      =  3

3 0
3 years ago
Please help!!!!!!! Thanks
stira [4]

Answer:

145

Step-by-step explanation:

m<4 and m<3 would equal 90 so subtract 55 from 90 and you get 35 for m<3 so you subtract 35 from 180 and you get 145

3 0
3 years ago
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