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solong [7]
2 years ago
9

−4[−5(7−13)−19]2(−1)

Mathematics
1 answer:
nataly862011 [7]2 years ago
5 0
Husband was a great and we can
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Find the dimensions of the rectangular box of maximum volume if the sum of the length, width, and height equals 180. (Give exact
Cloud [144]

Step-by-step explanation:

Let the dimension of the box be x, y and z.

Volume of the box V = xyz

Since the box is a rectangular box, the base will be a square of equal length.

V = x²h where h is the height of the box

If the sum of the length, width, and height equals 180, then x+x+h = 180

2x+h = 180

h = 180-2x

Substitute h = 180-2x into the volume of the box

V = x²(180-2x)

V = 180x²-2x³

The box has its maximum volume when \frac{dV}{dx} = 0

\frac{dV}{dx} = 360x-6x^{2}

360x-6x^{2} = 0\\360x = 6x^2\\360 = 6x\\6x = 360\\x = \frac{360}{6}\\ x = 60

Since 2x+h = 180

Substitute x = 60 into the equation ang get the height h

2(60)+h = 180

120+h = 180

h = 180-120

h = 60

Hence the dimension of the rectangular box is 60 by 60 by 60

6 0
4 years ago
Find the LCM of the following and with working is important
ahrayia [7]

Step-by-step explanation:

a. 3

b. I think it's 1

c. the same with b

d. 3

e. 7

f. 2

if is helpful ❤❤

THANK YOU.

4 0
3 years ago
A circle is drawn within a square as shown. What is the best approximation for the area of the shaded region? Use 3.14 to approx
puteri [66]
The answer is around 168.56

work :

the side of the square is 28 in


so the diameter of the circle is 28 in, too(look at the picture)

then the radius is 14 (28/2)


the area of the circle is
(14 \times 14) \times 3.14 = 615.44

the area of the square is
{28}^{2}  = 784


so the area of the shaded region will be around:
784 - 615.44 = 168.56


good luck

6 0
3 years ago
Read 2 more answers
*The time (t) required to do a job varies inversely as the number of people working. *
VashaNatasha [74]

Answer:

3.8

Step-by-step explanation:

If it takes 6 for 5 cooks to do 1 dinner, 1 cook does 1 dinner in 6*5 = 30 hours. 8 cooks can do 1 dinner in 30/8 hours or 3.75 which rounded is 3.8

Can I have Brainliest if I'm correct?

3 0
3 years ago
A high percentage of people who fracture or dislocate a bone see a doctor for that condition. Suppose the percentage is 99%. Con
marishachu [46]

Answer:

(i) 0.15708

(ii) 0.432488

(iii) 3

Step-by-step explanation:

Given that, 99% of people who fracture or dislocate a bone see a doctor for that condition.

There is only two chance either the person having fracture or dislocation of bone will either see the doctor or not.

As per previous data, if one person got a fracture or dislocation of bone, the chance of seeing the doctor is 0.99. Assuming this chance is the same for every individual, so the total number of people having fractured or dislocated a bone can be considered as Bernoulli's population.

Let p be the probability of success represented by the chances of not seeing a doctor by any one individual having fractured or dislocated a bone.

So, p=1-0.99=0.01

According to Bernoulli's theorem, the probability of exactly r success among the total of n randomly selected from Bernoulli's population is

P(r)=\binom{n}{r}p^r(1-p)^{n-r}\cdots(i)

(i) The total number of persons randomly selected, n=400.

The probability that exactly 5 of them did not see a doctor

So, r=5 , p=0.01

Using equation (i),

P(r=5)=\binom{400}{5}(0.01)^5(1-0.01)^{400-5}

=\frac{400!}{(400-5)!\times 5!}(0.01)^5(0.99)^{395}

=0.15708

(ii) The probability that fewer than four of them did not see a doctor

=P(r

=P(r=0)+P(r=1)+P(r=2)+P(r=3)

=\binom{400}{0}(0.01)^0(0.99)^{400}+\binom{400}{1}(0.01)^1(0.99)^{399}+\binom{400}{2}(0.01)^2(0.99)^{398}+\binom{400}{3}(0.01)^3(0.99)^{397}

=0.017951+0.072527+0.146154+0.195856

=0.432488

(iii) The expected number of people who would not see a doctor

=np

=300\times 0.01

=3

7 0
3 years ago
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