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Karolina [17]
3 years ago
12

2(4)+ 4(1)= 12 Solution

Mathematics
2 answers:
sergejj [24]3 years ago
8 0
The answer is 12=12 I think
grin007 [14]3 years ago
5 0
2*4+4*1=12
8+4=12

2times 4 is 8 + 4 times 1 is 4 which if you add those up you will get 12
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If you add 21 to my number and then multiply the result by 3, you will get 84 more than two-thirds of my number. Find my number.
Ksivusya [100]

Based on the calculations, the unknown number is equal to \frac{-45}{7}

  • Let the unknown number be x.

<h3>How to find an unknown number:</h3>

Translate the word problem into an algebraic expression, we have;

Adding 21 to the unknown number:

21 +x

Multiplying the result by 3:

3\times (21+x)

84 more than two-thirds of the unknown number:

\frac{2x}{3} +84

Equating the equations, we have:

3\times (21+x) = \frac{2x}{3} +84\\\\43+3x=\frac{2x}{3} +84

Cross-multiplying, we have:

43+3x=\frac{2x}{3} +84\\\\129+9x=2x+84\\\\9x-2x=84-129\\\\7x=-45\\\\x=\frac{-45}{7}

Read more on word problems here: brainly.com/question/13170908

5 0
3 years ago
Building A is 400 feet tall and Building B is 300 feet tall. Johnny is standing in between the two building. The angle of elevat
Free_Kalibri [48]

Answer:

389 feets apart

Step-by-step explanation:

Given that:

Building A

Height = 400feets

Angle of elevation = 70°

Building B:

Height = 300 feets

Angle of elevation = 52°

Distance from the foot of building A to where Jonny is standing = x (see attached picture)

Using trigonometry :

Tanθ = opposite / Adjacent

Tan 70 = 400/ x

2.7474774x = 400

x = 145.58809 feets

Distance from the foot of building B to where Jonny is standing = y (see attached picture)

Using trigonometry :

Tanθ = opposite / Adjacent

Tan 52 = 300/ y

1.2799416y = 300

y = 145.59

y = 234.38568 feets

x + y = distance between the two buildings

(145.58809 + 234.38568) feets

= 379.97377

= 380 feets apart

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3 years ago
A sequence of digits has the property that each pair of successive digits, taken in the order written, forms a decimal numeral r
alex41 [277]

Answer:

Concept: Mathematical Sequences

  1. Let An be 99 a double digit multiple
  2. The sequence is finite.
  3. Finite= restricted and not bounded to positive infinity
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7 0
3 years ago
A large scale weight 3000 pound 5 ounce, which of the following scales weigh in ounces?​
aleksklad [387]

Answer:

1 pound =

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Step-by-step explanation:

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4 0
4 years ago
The ratio of students wearing sandals to those wearing sneakers is 5 : 1. If there are 30 students in the class, and all of them
mart [117]

Answer:

Step-by-step explanation:

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