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sergeinik [125]
3 years ago
8

There are 120 people in a school canteen.

Mathematics
1 answer:
cluponka [151]3 years ago
8 0

2:1

Step-by-step explanation:

List all variables

Total people=120

year 11 students=120/2=60

year 10 students=60/3=20

subtract year 10 and 11 students from the total to get the number of year 9 students

year 9 students=120-60-20

=40

year9:year10

40:20

2:1

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The difference of the square of a number and 28 is equal to 3 times that number
Pepsi [2]

Answer:

- 4, 7

Step-by-step explanation:

Let the required number be x.

Therefore, according to the given condition:

{x}^{2}  - 28 = 3x \\  {x}^{2}  - 3x - 28 = 0 \\  {x}^{2}  - 7x + 4x - 28 = 0 \\ x(x - 7) + 4(x - 7) = 0 \\ (x - 7)(x + 4) = 0 \\ x - 7 = 0 \: or \: x + 4 = 0 \\ x = 7 \: or \: x =  - 4 \\

5 0
3 years ago
3. The surface area of the sphere is 30 m2. Find the radius of the sphere.​
pickupchik [31]

Answer:

Step-by-step explanation:

The formula for the surface area is A = 4πr².  This formula can be solved for r² and then the result solved for the radius, r:

         A

r² = --------     The radius of the sphere is as follows:

        4π

√(30 m²)

-------------- meters

     2√π

7 0
3 years ago
Subtract: (3m2 + 2n) – (m2 + 2n)
maksim [4K]
The negative in front of the second bracket means that it's times by -1 so each of their signs switches: 
3m^2+2n-m^2-2n 
Add like terms 
2m^2 
the 2n cancels out 
8 0
3 years ago
Read 2 more answers
Just the answers please
astraxan [27]
Angle E to angle T
Angle F to angle S
Angle G to angle U
EF is TS
FG is SU
TU is GE
Hope it helps :)
6 0
3 years ago
30 points if correct.
leva [86]

Multiply her pay per hour times number of hours worked.

For a normal 40 hour week, she is paid 16.34 per hour:

16.34 x 40 = 653.60


Overtime is any  hours over 40, so if she works 60 hours, she would have 20 hours of over time.

Multiply 20 hours by her overtime rate:

20 x 24.51 = 490.20

Now add this to her normal 40 hour pay:

490.20 + 653.60 = 1143.80


So her range is from 40 hours: 653.60 to 60 hours: 1143.80


The answer would be A

5 0
3 years ago
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