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kolezko [41]
3 years ago
14

In sm.smiths class 75% of the students are girls.there are 18 girls in the class.what is the total number of students in ms.mith

s class?
Mathematics
2 answers:
Natali [406]3 years ago
5 0
24 students are in ms.smiths class total
zloy xaker [14]3 years ago
3 0
3x/4 = 18

3x = 72

x = 72/3 = 24 students total
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What is the Lcm of 42 and 54
katen-ka-za [31]
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3 years ago
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Given j(x) = x + 5, what is the value of j(12)?
yarga [219]

Answer:

j(12) = 17

General Formulas and Concepts:

<u>Pre-Algebra</u>

Order of Operations: BPEMDAS

  1. Brackets
  2. Parenthesis
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Step-by-step explanation:

<u>Step 1: Define</u>

j(x) = x + 5

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<u>Step 2: Evaluate</u>

  1. Substitute in <em>x</em>:                    j(12) = 12 + 5
  2. Add:                                     j(12) = 17
8 0
2 years ago
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Free_Kalibri [48]
80=-8a 
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Once you have solved each side you will get the following. 
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3 years ago
Joel is designing a ramp for a bike trick. He draws this diagram. What is the value of x?
inn [45]

Answer:

x = -1

x = 5

Step-by-step explanation:

Use pythagorean theorem: a² + b² = c²

x² + (2x + 2)² = (2x + 3)²

Since these are quantities, you'll have to make them into quadratic equations.

(2x + 2)(2x + 2) = 4x² + 4x + 4x + 4

(2x + 3)(2x + 3) = 4x² + 6x + 6x + 9

x² + 4x² + 4x + 4x + 4 = 4x² + 6x + 6x + 9

Combine like terms

5x² + 8x + 4 = 4x² + 12x + 9

Move one side to set the equation equal to 0

x² - 4x - 5 = 0

Solve

x² - 5x + x - 5 = 0

x(x - 5) + 1(x - 5) = 0

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<em>We</em><em> </em><em>can</em><em> </em><em>check</em><em> </em><em>that</em><em> </em><em>these</em><em> </em><em>are</em><em> </em><em>correct</em><em> </em><em>by</em><em> </em><em>plugging</em><em> </em><em>them</em><em> </em><em>in</em><em> </em><em>for</em><em> </em><em>x</em><em> </em><em>and</em><em> </em><em>seeing</em><em> </em><em>if</em><em> </em><em>they</em><em> </em><em>are</em><em> </em><em>equal</em>

<em>For</em><em> </em><em>example</em>

<em>(</em><em>-1</em><em>)</em><em>²</em><em> </em><em>+</em><em> </em><em>(</em><em>2</em><em>(</em><em>-1</em><em>)</em><em> </em><em>+</em><em> </em><em>2</em><em>)</em><em>²</em><em> </em><em>=</em><em> </em><em>(</em><em>2</em><em>(</em><em>-1</em><em>)</em><em> </em><em>+</em><em> </em><em>3</em><em>)</em><em>²</em>

<em>1</em><em> </em><em>=</em><em> </em><em>1</em>

3 0
2 years ago
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