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elena55 [62]
2 years ago
7

there are 30 students in Sam's history class. out of that number, 18 are girls. If one student is absent, what is the probabilit

y that the student will be a girl?
Mathematics
2 answers:
Cerrena [4.2K]2 years ago
7 0
I’m fraction form, the answer would be 12/30. The fraction as a simplified version is 2/5.
dmitriy555 [2]2 years ago
5 0
60% chance that a girl would be absent
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How do i solve -3x-5=10
natulia [17]

Answer:

x= -5

Step-by-step explanation:

Add 5 to both sides

-3x -5+5 = 10 +5

-3x = 15

Divide both sides by -3.

-3x/-3= 15/-3

      x= -5

8 0
2 years ago
Suppose brine containing 0.2 kg of salt per liter runs into a tank initially filled with 500 L of water containing 5 kg of salt.
Oliga [24]

Answer:

(a) 0.288 kg/liter

(b) 0.061408 kg/liter

Step-by-step explanation:

(a) The mass of salt entering the tank per minute, x = 0.2 kg/L × 5 L/minute = 1 kg/minute

The mass of salt exiting the tank per minute = 5 × (5 + x)/500

The increase per minute, Δ/dt, in the mass of salt in the tank is given as follows;

Δ/dt = x - 5 × (5 + x)/500

The increase, in mass, Δ, after an increase in time, dt, is therefore;

Δ = (x - 5 × (5 + x)/500)·dt

Integrating with a graphing calculator, with limits 0, 10, gives;

Δ = (99·x - 5)/10

Substituting x = 1 gives

(99 × 1 - 5)/10 = 9.4 kg

The concentration of the salt and water in the tank after 10 minutes = (Initial mass of salt in the tank + Increase in the mass of the salt in the tank)/(Volume of the tank)

∴ The concentration of the salt and water in the tank after 10 minutes =  (5 + 9.4)/500 = (14.4)/500 = 0.288

The concentration of the salt and water in the tank after 10 minutes = 0.288 kg/liter

(b) With the added leak, we now have;

Δ/dt = x - 6 × (14.4 + x)/500

Δ = x - 6 × (14.4 + x)/500·dt

Integrating with a graphing calculator, with limits 0, 20, gives;

Δ = 19.76·x -3.456 = 16.304

Where x = 1

The increase in mass after an increase in = 16.304 kg

The total mass = 16.304 + 14.4 = 30.704 kg

The concentration of the salt in the tank then becomes;

Concentration = 30.704/500 = 0.061408 kg/liter.

6 0
3 years ago
I really don’t know how to do this at all , help
klasskru [66]

Answer:

Plot -11 on the tick mark directly to the left of -10.

Step-by-step explanation:

Hope this helps!

-Josh

5 0
2 years ago
Read 2 more answers
Please have an explanation with it
Nataly_w [17]

Hello from MrBillDoesMath!

Answer:

The protein/calories ratios  are equivalent

Discussion:

For the first column

Protein/calories = 24/96 = 1/4

For the second column

Protein/calories = 28/112 = 1/4

So the protein/calories ratios  are equivalent

Thank you,

MrB

7 0
3 years ago
Help fast! give extra points
AleksandrR [38]

Answer:

3X x 5 = 15x - 3 = 12x

7 0
2 years ago
Read 2 more answers
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