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3 years ago

The square of 9 less than a number is 3 less than the number. What is the number?

Mathematics

2 answers:

ludmilkaskok [199]3 years ago

5 0

Answer:

D. 7 or 12

Step-by-step explanation:

Just took it. Edg 2020. Hope this helps :)

alexdok [17]3 years ago

4 0

Answer:

7, 12

Step-by-step explanation:

( n-9)^2 = n-3

Foil the right

n^2 -18n +81 = n-3

Subtract n from each side

n^2 -19n +81 =-3

Add 3 to each side

n^2 -19n +84 = 0

Factor

What 2 numbers multiply to 84 and add to -19

-12*-7 = 84

-12+-7 = -19

( n-7) (n-12) =0

Using the zero product property

n-7 =0 n-12= 0

n=7 n=12

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739/1000 as a decimal

FrozenT [24]

0.739 is the answer that I got (this is not a rounded answer by the way)
hope it helps :)

3 0

3 years ago

Read 2 more answers

A researcher wishes to estimate, with 9090% confidence, the proportion of adults who have high-speed Internet access. Her es

Sunny_sXe [5.5K]

Answer: a) Required minimum sample size= 219

b) Required minimum sample size= 271

Step-by-step explanation:

As per given , we have

Margin of error : E= 5% =0.05

Critical z-value for 90% confidence interval : $z_{\alpha/2}=1.645$

a) Prior estimate of true proportion: p=28%=0.28

Formula to find the sample size :-

$n=p(1-p)(\dfrac{z_{\alpha/2}}{E})^2\\\\=0.28(1-0.28)(\dfrac{1.645}{0.05})^2\\\\=218.213856\approx219$

Required minimum sample size= 219

b) If no estimate of true proportion is given , then we assume p= 0.5

Formula to find the sample size :-

$n=0.5(1-0.5)(\dfrac{z_{\alpha/2}}{E})^2\\\\=0.25(\dfrac{1.645}{0.05})^2\\\\=270.6025\approx271$

Required minimum sample size= 271

8 0

3 years ago

If tan theta =24 over 45 find tan theta minus cos theta. <br>

juin [17]

Answer:

24/45 - 45/51

Step-by-step explanation:

Tangent can be expressed as opposite/adjacent. So, create a right triangle with one leg = 24 and the other = 45. The hypotenuse is 51 by the Pythagorean theorem. Cosine is adjacent/hypotenuse, so it would be 45/51.

4 0

3 years ago

A rectangular painting measures 15 inches by 18 inches and contains a frame of uniform width around the four edges. The perimete

vfiekz [6]

Answer:

3 inches

Step-by-step explanation:

Lenght = 18 inches

Width =15 inches

Perimeter of the rectangular painting and frame = 90 inches

Let X be the width of the frame

The width of the framed picture = 15 + 2x

The length of the framed picture = 18 + 2x

Perimeter = 2 (L + W)

90 = 2(15 + 2x + 18+ 2x)

90 = 2(33 + 4x)

90 = 66 + 8x

8x = 90 - 66

8x = 24

x = 24/8

x = 3 inches

the width of the frame is 3 inches

5 0

3 years ago

Two cylinders are shown below. Find the volume of each cylinder. Use 3.14 for π. Round your answers to the nearest hundredth. a.

Katena32 [7]

Answer:

3-8I am right or wrong and the answer is 5

4 0

3 years ago