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3 years ago

What are the building blocks of geometry?

1 answer:

5 0

This is a very general question but i would say
Rays- One direction arrows
Lines- line segment with arrows in both directions
Planes
Bisects
Colinear
Co planar
stuff like this builds geometry

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the side length of a square can be expressed as 2x+3. If the area of the square is 121 square meters, what is the value of x?

lyudmila [28]

Answer:

x=4

Step-by-step explanation:

(2x+3)^2=121

2x+3=square root of 121

2x+3=11

2x=11-3

2x=8

x=4

(in a square all sides are equal therefore area =length ×width where length and width=2x+3)

6 0

3 years ago

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kykrilka [37]

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8 0

3 years ago

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Solve for x <br> Picture is above

Phantasy [73]

Answer:

x = 10

Step-by-step explanation:

a² + b² = c²

6² + 8² = c²

36 + 64 = 100

√100 = ±10

x = 10

3 0

3 years ago

Read 2 more answers

7) please show the work thanks

Mrac [35]

Answer:

$it's upside-down$ Step-by-step explanation:

3 0

3 years ago

Here are summary statistics for randomly selected weights of newborn girls: n=185,

Anna11 [10]

Answer:

The confidence interval for the population mean μ is $32.487$

Step-by-step explanation:

Given :

Number of weights of newborn girls n=185.

Mean $\bar{x}=31.4$ hg

Standard deviation s=7.5 hg

Use a 95% confidence level i.e. cl=0.95

To find : What is the confidence interval for the population mean μ?

Solution :

Using t-distribution,

The degree of freedom $DF=n-1=185-1=184$

$\alpha=\frac{1-0.95}{2}$

$\alpha=0.025$

The t critical value is t=1.973.

The confidence interval build is

$CI=\bar{x}\pm(t\cdot \frac{s}{\sqrt{n}})$

Substitute the values,

$CI=31.4\pm(1.973\cdot \frac{7.5}{\sqrt{185}})$

$CI=31.4\pm(1.973\cdot 0.5514)$

$CI=31.4\pm(1.087)$

$31.4+1.087$

$32.487$

Therefore, the confidence interval for the population mean μ is $32.487$

6 0

3 years ago