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Harman [31]
2 years ago
13

Pls help ??????????????

Mathematics
2 answers:
EastWind [94]2 years ago
7 0

Answer:

14

Explanation:

First off, the ratio is 1f/20b(f=fleece, b=bottles).So now it says that the ratio is (unknown)f/280b. To find the answer you have to take 280 x 1 / 20. The and if you do that, the answer comes out to be 14.

I hope I helped

blagie [28]2 years ago
4 0
The picture is cutted off
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URGENT!!!!<br> Please add workings out
Artist 52 [7]

Answer: 26.457 cm

Explanation:

First, the height of an equilateral triangle of side length a is:

h = \frac{\sqrt{3} }{2}*a

In this case, the side-length of the triangles is a = 10cm, then the height will be:

h = \frac{\sqrt{3} }{2}*10cm = 8.66cm

Now we can think on a triangle rectangle such that:

Point A and point F are vertexes of the triangle.

The line we want to find, the line from A to F, is the hypotenuse.

One cathetus is a the height of the triangle, that comes down from point A, the length of this cathetus is 8.66cm

The other cathetus is equal to half the side length of the triangles (5cm) plus the segments BD and DF (of 10cm each)

Then the length of this cathetus is 10cm + 10cm + 5cm = 25cm

Now, we can remember the Pythagorean theorem.

If H is the hypotenuse, and A and B are the catheti, then we have:

A^2 + B^2 = H^2

In this case, we know the length of both cathetus, and want to know the length of the hypotenuse, then:

(25cm)^2 + (8.66cm)^2 = H^2

√( (25cm)^2 + (8.66cm)^2) = H = 26.457 cm

Then the line from A to F is 26.457 cm

6 0
2 years ago
To which set or sets does the number 7 belong​: natural​ numbers, whole​ numbers, integers, rational​ numbers, irrational​ numbe
Vedmedyk [2.9K]

Answer:

integers

Step-by-step explanation:

hope this is helpful

5 0
2 years ago
Dois triângulos semelhantes possuem razão entre suas áreas igual a 9. Se o perímetro de um deles é 10, o perímetro do outro deve
Digiron [165]

Answer:

O perímetro do outro triângulo deve ser ou de 30 unidades de comprimento, ou de 3.33 unidades de comprimento.

Step-by-step explanation:

Dois triângulos semelhantes possuem razão entre suas áreas igual a 9.

O perímetro tem grau um, enquanto a área tem grau 2. Isto implica que a razão entre os perímetros é a raiz quadrada da razão entre as áreas, então a razão entre os perímetros é de 3.

Se o perímetro de um deles é 10, o perímetro do outro deve ser:

Ou 10*3 = 30, ou \frac{10}{3} = 3.33

O perímetro do outro triângulo deve ser ou de 30 unidades de comprimento, ou de 3.33 unidades de comprimento.

5 0
2 years ago
Need help on the stretch problem.
Licemer1 [7]

Step-by-step explanation:

ΔACX is an isosceles triangle, so ∠AXC = ∠XAC.  We'll call the measure of this angle x°.

∠AXC and ∠BXC are supplementary, so ∠AXC + ∠BXC = 180.  That means ∠BXC = 180 − x.

ΔBXC is an isosceles triangle, so ∠XBC = ∠XCB.  We'll call the measure of this angle y°.

Angles of a triangle add up to 180, so:

y + y + (180 − x) = 180

2y = x

y = x/2

∠ACX and ∠XCB are complementary, so ∠ACX + ∠XCB = 90.

x + y = 90

x + x/2 = 90

3/2 x = 90

x = 60

Therefore, ∠AXC = ∠XAC = 60°.

8 0
2 years ago
A tank initially contains 50 liters of water with 15kg of salt mixed in. Salt water with concentration 1/3 kg/L runs in at the r
Nimfa-mama [501]

Answer:

13.57 kg

Step-by-step explanation:

Let the amount of salt in a tank be =\frac{salt in the tank}{volume of salt in the tank}

                                                         =    \frac{15}{50}

                                                         =  0.3 kg/L

The concentration of salt coming into the tank = 0.333kg/L

We know that the concentration of salt leaving the tank should be:

amount of salt in the tank/volume of tank = y(t)/50 L

rate of change of salt = rate in - rate out

\frac{dy}{dt} = 0.66 - \frac{y}{50}

solving the differential equation gives :

ln y = 0.66/y (t) - 0.02 t + C

Initial conditions, t= 0; y (0) = 15

then ln 15 = C

ln y = \frac{0.66}{y}t - 0.02t + ln 15

ln\frac{y}{15} = 0.02t

y = 15e( exp -0.02t)

the amount of salt in 5 mins will be:

y (t) = 15e(exp -0.02 (5)

      = 13.57 kg

4 0
3 years ago
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