All categories

3 years ago

-5n +8=-7 two step equations - intergers

Mathematics

1 answer:

vaieri [72.5K]3 years ago

5 0

-5n + 8 = -7
-5n + 8 - 8 = -7 -8
-5n = -15
-5n/-5 = -15/-5
n = 3

You might be interested in

The cost of 28 pounds horse feed is 63.28 what is the per pound of horse feed

Bas_tet [7]

$2.26 pounds of horse feed

8 0

2 years ago

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

Let X = Numbers of girls in groups of 36 births

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

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

Mean, 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;

Standard deviation, 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

I’m confused on this one

Lorico [155]

The question is asking which of the following does not have side that are parallel. So which of them have lines that would never touch if they were never ending lines.

4 0

3 years ago

Simplify the expression -3 (b-7)

Nataliya [291]

Simply distribute the -3 across the b and -7.

-3(b - 7) = (-3 * b) + (-3 * -7) = -3b + 21

Hope this was helpful, if it wasn't just drop me a DM explaining what didn't make sense.

5 0

3 years ago

Please all answers I'm in a hurry

givi [52]

#2 is 35°C (just plug in 95 to the formula)

#3:
in the left column are:
(8x-(6+y))
(3/4)w+x^2

in the right column are:
y^2-0.5w
w/4+3(x+y)

to solve you just plug in to the formula

6 0

3 years ago