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Fittoniya [83]
3 years ago
9

In a class of 40 students, 5 like neither Nokia nor

Mathematics
1 answer:
STatiana [176]3 years ago
7 0

Answer:

<em><u>The number of students that like only Nokia </u></em>

<h2>= 30</h2>

Step-by-step explanation:

consider N the number of students who like Nokia → N=?

               T the number of students who like Techno → T=35

Statement 1: In a class of 40 students, 5 like neither Nokia nor Techno

we can translate it like this: 35 student like Nokia or Techno

we can note it like this : T∪N= 35

Statement 2: 30 like Techno and Nokia

we can note it : T∩N = 30

using a rule concerning the number of element of a set :

T∪N = N + T - T∩N

then

35 = N + 35 - 30

⇒ N - 30 = 0

⇒ N = 30

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The solution of the equation is x = -4/3.

<h3>What does it mean to solve an equation?</h3>

An equation represents equality of two or more mathematical expression.

Solutions to an equation are those values of the variables involved in that equation for which the equation is true.

WE have been given an equation as;

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In an absolute value equation, we solve the original expression as our first equation. Our second one is that we multiply the right side by -1.

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|x - 4| = 5x + 12

x - 4 = 5x + 12

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|x - 4| = 5x + 12

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Now,  |x - 4| = 5x + 12

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3 years ago
The regular selling price of a pair of men's jeans is $39.99. The markdown rate is 20%. What is the sale price of the jeans to t
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