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3 years ago

13

I seriously need help with this. I pay attention in class it's just so confusing!! I'm giving extra points. Now 15. Please tell

the truth <3

1 answer:

brilliants [131]3 years ago

8 0

Answer:

D

Step-by-step explanation:

Its D because A is all 90 degrees

Not C because all 90

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How do you solve this problem<br><br>35/8y+1491-2y

o-na [289]

Answer:

I suggest using the website called Cymath https://www.cymath.com/

it allows u to type in problems like this and shows you how to do it

Hope this helped!! Have a good day c;

Step-by-step explanation:

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3 years ago

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Expand the following expression <br> (x + 2)(x² – 3x - 1)

Cloud [144]

Answer:

$x^{3} - x^{2} - 7x -2$

Step-by-step explanation:

Give me brainllest

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3 years ago

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SOMEONE PLEASE HELP MEEE!!!! HOW DO YOU DO THIS

UkoKoshka [18]

Answer:

A. 162 m²

Step-by-step explanation:

==>Given:

Isosceles trapezoid with:

base a = 19m

base b = 35m

Perimeter = 74meters

==>Required:

Area of trapezoid

==>Solution:

Recall: the length of the legs of an isosceles trapezoid are equal.

Perimeter of isosceles trapezoid = sum of the parallel sides + 2(length of a leg of the trapezoid)

Let l = leg of trapezoid.

Perimeter = 74m

Sum of parallel sides = a+b = 19+35 = 54m

Thus,

74 = 54 + 2(l)

74 - 54 = 2(l)

20 = 2(l)

l = 20/2 = 10m

Let's find area:

Area = ½(a+b)*h

a = 19

b = 35

h = ?

Using Pythagorean theorem, let's find h as follows:

h² = l² - [(35-19)/2)²

h² = 10² - [16/2]²

h² = 100 - 64

h² = 36

h = √36 = 6m

Area = ½ x (a+b) × h

= ½ × (19+35) × 6

= ½ × 54 × 6

= 27 × 6

Area = 162m²

6 0

3 years ago

A beam of light from a monochromatic laser shines into a piece of glass. The glass has thickness L and index of refraction n=1.5

boyakko [2]

Additional information to complete the question:

How long does it take for a short pulse of light to travel from one end of the glass to the other?

Express your answer in terms of some or all of the variables f and L. Use the numeric value given for n in the introduction.

T = ___________ s

Answer:

$T = \frac{15}{f}$

Step-by-step explanation:

Given:

Thickness og glass = L

Index of refraction n=1.5

Frequency = f

$Wavelength = \frac{L}{10}$

λ(air) $= \frac{L}{10}$

λ(glass) = λ(air) / n

= $\frac{\frac{L}{10}}{1.5}$

= $\frac{L}{10} * \frac{1}{1.5}$

= $\frac{L}{15}$

V(glass) = fλ(glass)

$= f * \frac{L}{15}$

$T = \frac{L}{V_{glass}} = \frac{15}{f}$

7 0

3 years ago

Estimate 32% of 19.

Kipish [7]

Answer: 13

Step-by-step explanation: calculator

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