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Korvikt [17]
3 years ago
8

QUESTION 4

Mathematics
1 answer:
Artemon [7]3 years ago
5 0

Answer:

66

Step-by-step explanation:

30+25+5+6 = 66.

There are 66 students in the class.

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If 8 times a number is added to twice the​ number, the result is 60. the solution is
Andrei [34K]

Answer:

(8 * x) + 2x = 60

8x + 2x = 60

10x = 60

/10   /10

x = 6

8 is a constant that is being multiplied by an unknown number which we will name x. It is then being added to two times the unknown number(x), so we multiply x by 2, which is 2x. The final product will be 60, so in the equation it'll then equal 60.

We consider "a number" to be a variable that withholds an unknown value, which is x (or any other variable you prefer).

3 0
2 years ago
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What is the root number of 121?
Rom4ik [11]

Answer:

11 is the root of 121 ........

3 0
2 years ago
Multiply<br> 3x( 4x – 3x+5)
Daniel [21]

Answer:

The answer is 3x^(2)+15x

7 0
3 years ago
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An object moving with a speed of 5m/s has a kinetic energy of 100J what is the mass of the object
Sphinxa [80]

Answer:

k. e. = 1/2 mv^2

100 = 1/2 * m * 5^2

100 = 1/2 * m * 25

m = 100* 2/25

m = 8 kg

hope it helps you

5 0
3 years ago
Quadratic equation
Murrr4er [49]

Answer:

<h2>            46</h2>

Step-by-step explanation:

x          -  age of a son three years ago

3x        -  age of a father three years ago

x + 3      -  age of the son now

3x + 3       -  age of the father now

x + 3 + 5       -  age of the son in five years time

3x + 3 + 5       -  age of the father in five years time

in five years time, the father will be twice as old as his son, so:

3x + 3 + 5 = 2(x + 3 + 5)

3x + 8 = 2x + 16

3x - 2x = 16 - 8

  x = 8

x + 3 + 4       -  age of the son in four years time

8 + 3 + 4 = 15

3x + 3 + 4       -  age of the father in four years time

3×8 + 3 + 4 = 31    

the sum of their ages in four years time:

15 + 31 = 46

8 0
3 years ago
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