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loris [4]
2 years ago
8

A hollow circular cone, radius of base 75mm and height 250mm is held vertex down with axis vertical. It contains water which is

leaking away through a small hole in the vertex at the rate of 900mm³s-¹, find the rate at which the water level is falling when it is 100mm above the vertex.​
Mathematics
1 answer:
Norma-Jean [14]2 years ago
8 0

Answer:

the answer is yes

\rm \: bcoz \: if \: you \: subtract \: 250mm \: to \: 900mm ^{3} s -  ^{1}  \: the \: answer \: is \: 100mm \: which \: is \: the \: vertex.

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Trevor paints 1/6 of the fence surrounding his farm each day. How many days will it take him to paint 3/4 of the fence ?​
Viefleur [7K]

9514 1404 393

Answer:

  4 1/2 days

Step-by-step explanation:

The time is given by ...

  time = quantity/rate

  time = (3/4 fence)/(1/6 fence/day) = (3/4)(6) days = 4 1/2 days

6 0
3 years ago
What is an equation of the line that passes through the point (3,-1) and is perpendicular to the equation y=-3x+2
Alex17521 [72]
If it is perpendicular then the slope of it will be:

-3 \times x = -1\\\\x = \frac{1}{3}

y = 1/3 x + b

-1 = (1/3)(3) + b

-1 = 1 + b

b = -2

The equation is:

y = \frac{1}{3}x - 2
8 0
3 years ago
HELP!!! ASAP!!! WILL MARK BRANLIST!!!!!
dybincka [34]
You’ve got the correct answer (which is the first one) hope this helps
5 0
2 years ago
Read 2 more answers
A bacteria culture starts with 160 bacteria and grows at a rate proportional to its size. After 5 hours there will be 800 bacter
Leona [35]

Answer:

Step-by-step explanation:

Let the rate at which the bacteria grow be represented by the exponential equation

P(t) = P0e^kt

P(t) is the population of the bacteria after time t

P0 is the initial population

k is the constant of variation

t is the time

If the initial Population is 160 bacteria's, them the equation becomes;

P(t) = 160e^kt

b) if After 5 hours there will be 800 bacteria, this means

at t = 5 p(t) = 800

Substitute and get k

800 = 160e^5k

800/160 = e^5k

5 = e^5k

Apply ln to both sides

Ln5 = lne^5k

ln5 = 5k

k = ln5/5

k = 0.3219

Next is to calculate the population after 7hrs i.e at t = 7

P(7) = 160e^0.3219(7)

P(7) = 160e^2.2532

P(7) = 160(9.5181)

P(7) = 1522.9

Hence the population after 7houra will be approximately 1523populations

c) To calculate the time it will take the population to reach 2790

When p(t) = 2790, t = ?

2790 = 160e^0.3219t

2790/160 = e^0.3219t

17.4375 = e^0.3219t

ln17.4375 = lne^0.3219t

2.8587 = 0.3219t

t = 2.8587/0.3219

t = 8.88 hrs

Hence it will take approximately 9hrs for the population to reach 2790

7 0
3 years ago
Help!!!!
Feliz [49]

Answer:

<h2>: 7-⁴</h2>

Step-by-step explanation:

<h3>Exponential Form :</h3><h3>(a^m*a^n ) = (a^m+n )</h3>

<h3>7^-6 = 7^-2 * x </h3>

<h3>(only 7^-4 the term that can add to 7^-2 gives </h3><h3>= 7^-6 )</h3>

<h3>7^-6 = 7^-2 + 7^-4 </h3>

<h3> ( a^m*a^n) = ( a^m+n)</h3>
6 0
2 years ago
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