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Naily [24]
2 years ago
9

1/7 of all students achieved great success in the written exercise in mathematics. 3/7 very good success. 2/7 good success, whil

e 4 students achieved sufficient success. How many students did the writing exercise?(fractions)​
Mathematics
1 answer:
laila [671]2 years ago
6 0

Answer:

x = 28

Step-by-step explanation:

Let the total number of students = x

x/7 + 3x/7 + 2x/7 + 4 = x If that is all there is.  If it isn't the problem can't be done. Combine like terms.

x(1 + 3 + 2)/7 + 4 = x

x (6/7) + 4 = x                       Subtract 6x/7 from both sides

4 = x - 6x/7

4 = 7x/7 - 6x/7                     Combine

4 = 1/7x                                Multiply both sides by 7

4*7 = 7x / 7

x = 28

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ω=km⎯⎯⎯⎯√ . This is the formula for the angular frequency ω of a mass m suspended from a spring of spring constant k. Solve this
Sindrei [870]

The formula for the mass in terms of angular velocity and spring constant is m = ω²/k

Given the expression as:

ω = √km

Given that

ω is the angular velocity

m is the mass suspended from a spring

k is the spring constant

Making m the subject of the formula

Step 1: Take the square of both sides

ω² = (√km)²

ω² = km

Step 2: Divide both sides by k

ω²/k = km/k

ω²/k = m

Swap

m = ω²/k

Hence the formula for the mass in terms of angular velocity and spring constant is m = ω²/k

Learn more here: brainly.com/question/21140562

6 0
3 years ago
A person is working at a constant rate. If he produces 15 details in 8 hours, how long does he need to work to produce 18 detail
Kryger [21]
15=8
15÷3=5
Answer is 20
8 0
4 years ago
Help me llliad plz neeeeeeed help
Lapatulllka [165]
Lets get started :)

Diameter = 2.5 ft
Radius = \frac{diameter}{2} = \frac{2.5}{2} = 1.25

a) The Circumference formula of a circle is given in the picture below, we can plug-in the given information

C = 2\pi(1.25) or 2.5\pi
    ≈ 7.85 ft 
(we can leave the answer in terms of pi {\pi})

b) We divide the total number of distance the tire will travel by the circumference to find how many times the tire will roll

\frac{5280}{circumference} = \frac{5280}{2.5 \pi } 
(I have used the value in feet because we found the circumference in feet units and notice that I took the value of circumference to be 2.5\pi instead of 7.85, to increase accuracy)

672.2

The tire will rotate 672 times (a tire cannot roll a decimal times, so we take to the nearest whole number) to travel 1 mile

7 0
3 years ago
If T(n) = 2n - 7 what is the 5th term
nadezda [96]
Plug in n = 5 to find the 5th term

T(5) = 2(5) - 7
T(5) = 10 - 7
T(5) = 3

The 5th term is 3.
3 0
3 years ago
Read 2 more answers
How do i graph x+4y=8​
Andrew [12]

Answer:

x = 8  y = 2

(8,2)

Step-by-step explanation:

You have to find the value of both x and y

x + 4y = 8

to find x you have to cancel out y so,

x + 4(0) = 8

x = 8

to find y you have to cancel out x

0 + 4y = 8

4y = 8

divide both sides by 4

y = 2

Hope this Helps!!!

6 0
3 years ago
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