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4 years ago

there are eight girls competing in an ice skating competition,in how many ways can they finish in first,second, and third place?

Mathematics

2 answers:

MrMuchimi4 years ago

7 0

There are 24 ways they would get 1st 2st 3rd

Andreas93 [3]4 years ago

5 0

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How many terms are in this expression?<br> 9x3+1+z

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3 terms are in the expression

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2 years ago

write an equation in point-slope form of the line that passes through the (7,-4) and has a slip of m=-6?

Leokris [45]

Answer:

y+4=-6(x-7)

Step-by-step explanation:

Point slope form is giving by the equation

y - y = m (x - x)

M being the slope and y and x being points

All you have to do is plug in your slope and point:

(y + 4) = -6 (x - 7)

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3 years ago

A tank contains 250 liters of fluid in which 40 grams of salt is dissolved. Brine containing 1 gram of salt per liter is then pu

VashaNatasha [74]

Answer:

$A(t)=250-210e^{-\frac{t}{50}}$

Step-by-step explanation:

We are given that

Volume,V=250 L

Mass of salt=m=40 g

Brine containing 1 g per liter

Pumped into the tank at the rate=5 L/min

We have to find the number A(t) of grams of salt in the tank at time t.

Rate of change of salt in the tank

$\frac{dA}{dt}=$ Rate in-Rate out

Rate in=5 L/min

Rate out= $\frac{A}{250}\times 5=\frac{A}{50}$ L/min

$\frac{dA}{dt}=5-\frac{A}{50}=\frac{250-A}{50}$

$\int \frac{50dA}{250-A}=\int dt$

$-50ln(250-A)=t+C$

Using the formula

$\int \frac{dx}{x}=ln x$

A=40 and t=0

$-50ln(250-40)=0+C$

$-50ln(210)=C$

Substitute the value

$-50ln(250-A)=t-50ln(210)$

$-50ln(250-A)+50ln(210)=t$

$50ln\frac{210}{250-A}=t$

$t=50ln\frac{210}{250-A}$

$\frac{t}{50}=ln\frac{210}{250-A}$

$\frac{210}{250-A}=e^{\frac{t}{50}$

$\frac{250-A}{210}=e^{-\frac{t}{50}}$

$250-A=210e^{-\frac{t}{50}}$

$A(t)=250-210e^{-\frac{t}{50}}$

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4 years ago

Someone help me with this pls

Nostrana [21]

(5^-2)^2 and 5^2•5^-6

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3 years ago

What is 4973 divided by 7

Firlakuza [10]

The answer is 710.42

3 0

4 years ago

Read 2 more answers