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Andrew [12]
3 years ago
9

Does anyone knows this please! -2x x 5x -(8x)^2

Mathematics
1 answer:
satela [25.4K]3 years ago
7 0

Answer:

-74x^2

Step-by-step explanation:

-2x x 5x -(8x)^2

-10x^2-(8x)^2

-10x^2-64x^2

-74x^2

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PLEASE HELP ME.<br> THANKS!!!
Veronika [31]

Cos(x) = sin(x + 20o) Use the double cos angle formula

Cos(x) = sin(x)*cos(20) + cos(x)*sin(20) Divide through by cos(x). Tanx = sin(x)/cos(x)

1 = tan(x)*cos(20) + sin(20) Subtract sin(20) from both sides.

1 - sin(20) = tan(x)*cos(20) Calculate the value of 1 - sin(20)

0.65798 = tan(x) * 0.939692 Divide by cos(20)

tan(x) = 0.65795/0.939692

tan(x) = 0.70021 Take the inverse of 0.7) = tan(x)

x = tan-1(0.70021)

x = 35 degrees as expected.

Problem Two

The easiest way to do this is to pick random values and try it. The two acute angles are complementary. So 25 and 65 are random enough.

Let A = 25

Let C = 65

A

Tan(25) = sin(25)/sin(65) ; tan(25) = 0.4663.

sin(25)/sin(65) = 0.4663 Answer

B

Sin(90 - C) = Sin(A)

Tan(90 - A) = Tan(C)

So the question becomes Cos(A) = Tan(C) / sin(A)

Cos(25) = Tan(65)/Sin(25)

0.906 = ? 5.07 This statement isn't true.

C

Sin(65) = Cos(25)/Tan(65)

.906 = 0.4226 C is not the correct answer.

D

D isn't true. The tan does not relate that away. You can find it for yourself.

Cos(A) = Tan(C) You should get 0.906 = 2.14

E

Sin(C) = Cos(A) / Tan(A) I'll leave you to show this is wrong.

Problem 3

The diagram below is for this problem. Cos(x) = 50/100 = 0.5

x = cos-1(0.5)

x = 60 degrees.

Part 2

Sin(60) = opposite / hypotenuse

opposite = sin(60) * hypotenuse

opposite = 86.61 Be sure and round this to whatever the question says to round it to.



4 0
3 years ago
Which matrix represents the system of equations shown below?<br> x = 10<br> 3x-9y = 7
OlgaM077 [116]
Y=4.1 because it if take ten. And multiply it by three then take negative 9Y equals seven and divided by nine gives you 4.1
3 0
3 years ago
A recipe calls for 1/2 cup sugar and 1 cup flour. Complete the table to show how much sugar and flour to use in different number
lubasha [3.4K]

Answer:

Well for every 1/2 cup of sugar its 1 cup of flour

Step-by-step explanation:

Just make a table like for example 5 1/2 cup of sugar brings you 11 cups of flour

Anoter example could be 5.5 cups of flour could be 3 cups of sugar yk?

7 0
3 years ago
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What is the equation of the following line? Be sure to scroll down first to see all answer options. (2,10) (0,0)
Karo-lina-s [1.5K]
It should be y=5x because the y intercept is 0
7 0
3 years ago
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A box of ground nutmeg weighs 1 1/3 ounces. If there is 20 teaspoons of nutmeg in the box, how much does one teaspoon or nutmeg
Sever21 [200]

Answer:

(1 1/3)/20= 1 1/15

One teaspoon of nutmeg weighs 1 1/15 ounces.

7 0
3 years ago
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