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slega [8]
4 years ago
8

Twenty less than thrice a number is 223.what is the number​

Mathematics
2 answers:
Tomtit [17]4 years ago
8 0

So I just did 3x-20=223

3x=243

x=243/3

x=81

so the answer would be 81

Vera_Pavlovna [14]4 years ago
6 0

Answer:

81

Step-by-step explanation:

Let the number be y.

20 less than 3 times y = 223

The expression is thus

3y - 20 = 223

Add 20 to both sides to eliminate -20 on the left

3y -20 + 20 = 223 + 20

3y = 243

Divide both sides by 3 to isolate y

3y/3 = 243/3

y = 81

The number is 81

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Find the area of the shaded region in the figure below, if the radius of the outer circle is 8 and the radius of the inner circl
Inessa05 [86]

Answer:

48 π

Step-by-step explanation:

Area of Circle =πr∧2

Big Circle Area = π(8)∧2 = 64π

Small Circle Area =π(4)∧2= 16π

Shaded Region = 64π - 16π = 48π

4 0
3 years ago
What is the value of x?
Molodets [167]

Answer:

x = 4√5

General Formulas and Concepts:

<u>Pre-Algebra</u>

  • Order of Operations: BPEMDAS

<u>Trigonometry</u>

  • Pythagorean Theorem: a² + b² = c²

Step-by-step explanation:

<u>Step 1: Define</u>

We are given a right triangle. We can use Pythagorean Theorem.

a = 19

b = x

c = 21

<u>Step 2: Find </u><em><u>x</u></em>

  1. Substitute:                    19² + x² = 21²
  2. Isolate <em>x</em> term:               x² = 21² - 19²
  3. Evaluate:                       x² = 441 - 361
  4. Subtract:                       x² = 80
  5. Isolate <em>x</em>:                       x = √80
  6. Simplify:                        x = 4√5

And we have our final answer!

8 0
3 years ago
I forgot to put the picture so- but pls help me don't just put something random
Digiron [165]

Answer:

-5

Step-by-step explanation:

just trust me bro and goodluck.

5 0
3 years ago
Read 2 more answers
Please help, correct answer gets brainiest incorrect/trolling is reported.
ioda

Answer:

5

Step-by-step explanation:

Rip

6 0
3 years ago
Read 2 more answers
Find the lengths of the missing sides in the triangle. Write your answers as integers or as decimals rounded to the nearest tent
nalin [4]

Answer:

The last one (x=11.3, y=8).

Step-by-step explanation:

1) There are three trigonometric ratios for right-angled triangles.

sin()=\frac{opposite}{hypotenuse}\\cos()=\frac{adjacent}{hypotenuse}\\tan()=\frac{opposite}{adjacent}

In a right triangle, the hypotenuse, h, is the side opposite the right angle. Relative to the acute angle θ, check the attachment, the legs are called the opposite side, o, and the adjacent side a.

2) In this case, we are given a length and an angle to find x and y.

Let's find x first. To find x we need to use sin()=\frac{opposite}{hypotenuse}.

sin(45)=\frac{8}{x}\\sin(45)x=8\\x=\frac{8}{sin(45)} \\x=11.31

Find y.

Notice that, we can use the Pythagorean Theorem (c^2=a^2+b^2) to find y.

c^2=a^2+b^2

11.31^2=8^2+b^2\\11.31^2 - 8^2 = b^2\\63.9161 = b^2\\\sqrt{63.9161} = b\\b = 7.99

3) Round them off to the nearest tenth.

x=11.31\\x=11.3

y=7.99\\y=8

Therefore, the correct choice is the last one (x=11.3, y=8).

4 0
2 years ago
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