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3 years ago

Can someone on help me 20 points!

Mathematics

1 answer:

nirvana33 [79]3 years ago

8 0

Answer:

7/8

Step-by-step explanation:

No probability numbers have been assigned to the branches, so there is insufficient information.

We note that "at least one head" includes all 7 branches above the last one (which is all tails). If the probabilities are all equal, then ...

p(h > 0) = 7/8

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WILL GIVE A BRAINLIEST IF UR RIGHT PLEASE HELP!!

Likurg_2 [28]

3 comes in the range 3 =< x <= 12

so its x + 4 = 3 + 4 = 7

B

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4 years ago

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Company ABC produces widgets. They have found that the cost, c (x), of making x widgets is a quadratic function in terms of x. T

Dahasolnce [82]

The given function is a quadratic equation. Any quadratic equation can be written in the form :

$C(x)=ax^{2}+bx+c$

The given points can be taken as (2,23) ,(4,55) and(10,247)

We form three equations with the given points

For point (2,23 ) the equation is

23 = 4a + 2b + c

For point (4,55) the equation is

55 = 16a + 4b + c

For point (10,247) the equation is:

247 = 100a+10b+c.

Solving the three equations for a,b,c we have :

32 = 12a + 2b

16 = 6a + b

and,

192 = 84 a + 6b

32 = 14a + b

Solving for a,b,c we have:

a=2 b=4 c=7

The quadratic equation is c(x)= $2x^{2}+4x+7.$

When x=8

c(x)= $2(8)^{2}+4(8)+7= 167.$ ]

Option C. $167 is the right answer.

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3 years ago

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7.2 cw homework help

kati45 [8]

Answer:

31. Yes (Y)

WXYZ ~ DABC

S.F.=4

32. Yes (Y)

GHIJ ~ KLMN

S.F.=2/3

33. Missing length: 16

34. Missing length: 30

35. x=7

36. x=10

Step-by-step explanation:

31. The polygons are similar if:

WX/DA=XY/AB

Then:

WX/DA=24/6→WX/DA=4

XY/AB=16/4→XY/AB=4

Like WX/DA=4=XY/AB, the polygons WXYZ and DABC are similar

Scale Factor: S.F.=XY/DA=XY/AB→S.F.=4

32. The polygons are similar if:

GH/KL=HI/LM=IJ/MN=GJ/KN

Then:

GH/KL=6/9=(6/3)/(9/3)→GH/KL=2/3

HI/LM=4/6=(4/2)/(6/2)→HI/LM=2/3

IJ/MN=4/6=(4/2)/(6/2)→IJ/MN=2/3

GJ/KN=4/6=(4/2)/(6/2)→GJ/KN=2/3

Like GH/KL=HI/LM=IJ/MN=GJ/KN=4, the polygons GHIJ and KLMN are similar

Scale Factor: S.F.=GH/KL=HI/LM=IJ/MN=GJ/KN→S.F.=2/3

33. If the polygons are similar, their sides must be proportional, then:

x/24=10/15

Simplifying the fraction on the right sides of the equation, dividing the numerator ans denominator by 5:

x/24=(10/5)/(15/5)

Dividing:

x/24=2/3

Solving for x: Multiplying both sides of the equation by 24:

24(x/24)=24(2/3)

Multiplying:

x=8(2)

x=16

34. If the polygons are similar, their sides must be proportional, then:

54/63=(54/9)/(63/9)→54/63=6/7

48/56=(48/8)/(56/8)→48/56=6/7

x/35=6/7

Solving for x: Multiplying both sides of the equation by 35:

35(x/35)=35(6/7)

Multiplying:

x=5(6)

x=30

36. (8x-2)/63=42/49

Simplifying the fraction on the right sides of the equation, dividing the numerator ans denominator by 7:

(8x-2)/63=(42/7)/(49/7)

Dividing:

(8x-2)/63=6/7

Solving for x: Multiplying both sides of the equation by 63:

63(8x-2)63=63(6/7)

Multiplying:

8x-2=9(6)

8x-2=54

Adding 2 both sides of the equation:

8x-2+2=54+2

Adding:

8x=56

Dividing both sides of the equation by 8:

8x/8=56/8

Dividing:

x=7

37. (6x-6)/63=42/49=30/35

Simplifying the fractions

(6x-6)/63=(42/7)/(49/7)=(30/5)/(35/5)

Dividing:

(6x-6)/63=6/7

Solving for x: Multiplying both sides of the equation by 63:

63(6x-6)63=63(6/7)

Multiplying:

6x-6=9(6)

6x-6=54

Adding 6 both sides of the equation:

6x-6+6=54+6

Adding:

6x=60

Dividing both sides of the equation by 6:

6x/6=60/6

Dividing:

x=10

8 0

3 years ago

Find a number x such that g(x) = -4

mel-nik [20]

Answer:

C: x = 7

Step-by-step explanation:

The easiest way to do this is to simply try all of the x-vales given as options.

Option 1: x = -1

Since $-1 \leq 0$ , we'll use the first equation.

$g(x)=\mid x \mid - 2\\g(-1)=\mid -1 \mid - 2 = 1 - 2 = -1$

As we can see, g(-1) is not -4.

Option 2: x = 3

Since $0 < 3 < 4$ , we'll use the 2nd equation.

$g(x) = x-3\\g(3) = 3-3 = 0$

Not -4.

Option 3: x = 7

Since $4 \leq 7$ , we'll use the 3rd equation.

$g(x) = 3-x\\g(7) = 3-7 = -4$

Tada! We have found a number such that g(x) = -4, it is 7. Since we only need to find a number, not all numbers, we don't have to check the last option. However, if you're curious:

Option 4: x = 4

Since $4 \leq 4$ (less than <em>or equal to</em>), we'll use the 3rd equation.

$g(x) = 3-x\\g(4) = 3-4 = -1$

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3 years ago

The Bun-and-Run is a franchise fast-food restaurant located in the Northeast specializing in halfpound hamburgers, fish sandwich

bija089 [108]

Answer:

franchise fast-food restaurant located in the Northeast specializing in halfpound hamburgers, fish sandwiches, and chicken sandwiches. Soft drinks and French fries are

also available. The planning department of Bun-and-Run Inc. reports that the distribution of

daily sales for restaurants follows the normal distribution and that the population standard

deviation is $3,000. A sample of 40 showed the mean daily sales to be $20,000. Find the 95%

confidence interval for the population mean.

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2 years ago