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svetoff [14.1K]
3 years ago
12

Ninth grade math help me PLEASEEEE PLEASE

Mathematics
1 answer:
dusya [7]3 years ago
3 0

Answer:

I believe the answer is D.

Step-by-step explanation:

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Suppose that a jewelry store tracked the amount of emeralds they sold each week to more accurately estimate how many emeralds to
denpristay [2]

Answer: The point estimate for the mean is <u>2.59</u> and the margin of error is <u>0.13</u> .

Step-by-step explanation:

The confidence interval for population mean is given by :-

\mu\pm E, where E is the margin of error .

Given : At the end of one year, the store used the weekly sales information to construct a 95% confidence interval for the mean number of emeralds sold per week.

The confidence interval they calculated was (2.46,2.72) .

The lower limit of the confidence interval : \mu-E=2.46                 (1)

The upper limit of the interval :  \mu+E=2.72                                 (2)

Adding (1) and (2) , we get

2\mu=5.18\\\\\Rightarrow\mu=2.59

Now, Subtracting (1) from (2) , we get

2E =0.26\\\\\Rightarrow\ E=0.13

Hence, the point estimate for the mean is 2.59 and the margin of error is 0.13 .

7 0
3 years ago
What is the axis of symmetry?
Scorpion4ik [409]

The axis of symmetry of a parabola is a vertical line that divides the parabola into two congruent halves. The axis of symmetry always passes through the vertex of the parabola . The -coordinate of the vertex is the equation of the axis of symmetry of the parabola.

Hopefully this helps:) Please mark me brainiest:)

3 0
3 years ago
Read 2 more answers
2x^2- 5x + 6 when x = -2
yarga [219]

Answer:

Step-by-step explanation:

x= -2

2x² - 5x + 6 = 2(-2)² - 5*(-2) + 6

                  = 2*4 + 10 + 6

                   = 8 + 10 + 6

                  = 24

8 0
3 years ago
What number should be placed in the box to help complete the division calculation? Long division setup showing an incomplete cal
lianna [129]

Answer:

The unknown value is being subtracted from 226 is 160

Step-by-step explanation:

Long division setup showing an incomplete calculation

  • 16 is in the divisor
  • 3426 is in the dividend
  • 2 hundreds and 1 tens is written in the quotient
  • 3200 is subtracted from 3426 to give 226
  • An unknown value represented by a box is being subtracted from 226

so,

The dividend = 3426

 The divisor = 16

2 hundreds means 200 and 1 tens means 10

∵ The quotient = 200 + 10 + x

∵ Dividend = divisor × quotient

∴ (16 × 200) + (16 × 10) + (16 × x) +remainder  = 3426  

∵ 16 × 200 = 3200

Subtract 3200 from the dividend  

∴ 3426 - 3200 = 226

∵ 16 × 10 = 160

∴ 226- 160 = 66

⇒160is the unknown value

∵ 16 × x = 16x  

∵ 66 - 16x = 0

∴ 66 = 16x

- Divide both sides by 16

∴ x = 4  and remainder = 2

∴ 3426 ÷ 16 = 200 + 10 + 4

∴ 3426 ÷ 16 = 214  

∴ From the steps above the missing number subtracted from

  226 is 160

The unknown value is being subtracted from 226 is 160

3 0
2 years ago
The fuel tank of a certain airplane can hold up to 300 gallons of fuel. Let W be the total weight of the airplane (in pounds). L
velikii [3]

Answer:

35

Step-by-step explanation:

335kpkk[

7 0
3 years ago
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