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3 years ago

Is 135 pages in 90 minutes faster that 180 pages in 120 minutes

Mathematics

1 answer:

ElenaW [278]3 years ago

7 0

Answer:

they are the same

Step-by-step explanation:

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The extensions of the legs AB and CD of a trapezoid ABCD intersect at point E. Find the lengths of the altitude of △AED drawn to

Gnom [1K]

let's call G the intersection point of EF & BC.

according to the thales' theorem:

$\frac{eg}{ef} = \frac{bc}{ad}$

and EF= EG+GF=EG+3

$\frac{eg}{eg + 3} = \frac{7}{21}$

$21eg = 7eg + 21$

$14eg = 21$

$eg = \frac{21}{14} = \frac{3}{2} = 1.5$

length of the altitude of △AED=EF

EF=EG+GF=1.5+3=4.5

8 0

3 years ago

Help please ASAP!!!!!!

kobusy [5.1K]

Answer:

y=( )-2 y=2

Step-by-step explanation:

y=mx+b

6 0

3 years ago

Read 2 more answers

The length of a radius of a circle, measured in centimeters, is represented by the expression x + 1.5. The diameter of the circl

Tomtit [17]

The value of x of a circle with radius x + 1.5 and diameter of 9 2 / 5 cm is 7.9 cm

<h3>Radius of a circle</h3>

Radius of a circle is half of the diameter of a circle. The radius extend from the centre of the circle to the circumference.

Mathematically,

radius = 1 / 2 (diameter)

Therefore,

radius = (x + 1.5) cm

diameter = 9 2 / 5 cm = 47 / 5 cm

let's find x with the relationship above.

Therefore,

x + 1.5 = 47 / 5

subtract 1.5 from both sides

x + 1.5 - 1.5 = 9.4 - 1.5

x = 7.9 cm

learn more on radius here: brainly.com/question/12183018

6 0

2 years ago

Multiply (5x2 + x − 4)(x + 2).

Trava [24]

(x + 2)(5x^2 + x - 4) =
x(5x^2 + x - 4) + 2(5x^2 + x - 4) =
5x^3 + x^2 - 4x + 10x^2 + 2x - 8 =
5x^3 + 11x^2 - 2x - 8 <===

6 0

3 years ago

Read 2 more answers

According to a certain website, wine critics generally use a wine-scoring scale to communicate their opinions on the relative qu

const2013 [10]

Answer:

$\bar x = 82$

$\sigma = 9.64$

Step-by-step explanation:

Given

$n = 12$

$87\ 91\ 86\ 82\ 72\ 91\ 60\ 77\ 80\ 79\ 83\ 96$

Solving (a); Point estimate of mean

To do this, we simply calculate the sample mean

$\bar x = \frac{\sum x}{n}$

$\bar x = \frac{87+ 91+ 86+ 82+72+91+60+77+80+79+83+96}{12}$

$\bar x = \frac{984}{12}$

$\bar x = 82$

Solving (b); Point estimate of standard deviation

To do this, we simply calculate the sample standard deviation

$\sigma = \sqrt{\frac{\sum(x-\bar x)^2}{n - 1}$

$\sigma = \sqrt\frac{(87-82)^2+ (91-82)^2+ ....+ (79-82)^2+ (83-82)^2+ (96-82)^2}{12-1}$

$\sigma = \sqrt\frac{1022}{11}$

$\sigma = \sqrt{92.91}$

$\sigma = 9.64$

<em>Note that: The sample mean and the sample standard deviation are the best point estimators for the mean and the standard deviation, respectively.</em>

<em>Hence, the need to solve for sample mean and sample standard deviation</em>

3 0

3 years ago