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matrenka [14]
3 years ago
12

An airliner travels 45 miles in 6 minutes. what is the speed in miles per hour?

Mathematics
2 answers:
Romashka-Z-Leto [24]3 years ago
7 0
6 minutes/60minutes = 0.1 hrs
45miles/0.1hour = 450 miles per hour or mph

Sergio039 [100]3 years ago
7 0
7.5 miles per hour is the answer 

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The ratio of students packing lunch to those buying lunch is 2 : 9. The number of students buying lunch is how many times the nu
DedPeter [7]

Answer:

4.5 times

Step-by-step explanation:

Packing to Buying is 2:9

Therefore, Buying to Packing will be 9:2.

9/2 = 4.5

4 0
3 years ago
9. The expression -8x? – 56x written in fully factored form is
Scorpion4ik [409]

Answer:

the answer is C

Step-by-step explanation:

hope this helps!

4 0
2 years ago
John wants to make cookies. To make cookies, he need 2 over 3 of a cup of flour per batch of cookies. If John has 4 cups of flou
Mnenie [13.5K]
\dfrac{2}{3} \text { cups = } 1 \text { batch}

----------------------------------------------
Find 1 cup :
----------------------------------------------

1 \text { cup = } 1 \div  \dfrac{2}{3} \text { batch}

1 \text { cup = } 1 \times  \dfrac{3}{2} \text { batch}

1 \text { cup = } \dfrac{3}{2} \text { batch}

----------------------------------------------
Find 4 cups :
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4 \text { cups = } \dfrac{3}{2} \times 4 \text { batch}

4 \text { cups = } \6 \text { batches}

--------------------------------------------------------------------------------------------
Answer: John can make 6 batches with 4 cups of flour.
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6 0
3 years ago
Suppose that a spherical droplet of liquid evaporates at a rate that is proportional to its surface area: where V = volume (mm3
Alex

Answer:

V = 20.2969 mm^3 @ t = 10

r = 1.692 mm @ t = 10

Step-by-step explanation:

The solution to the first order ordinary differential equation:

\frac{dV}{dt} = -kA

Using Euler's method

\frac{dVi}{dt} = -k *4pi*r^2_{i} = -k *4pi*(\frac {3 V_{i} }{4pi})^(2/3)\\ V_{i+1} = V'_{i} *h + V_{i}    \\

Where initial droplet volume is:

V(0) = \frac{4pi}{3} * r(0)^3 =  \frac{4pi}{3} * 2.5^3 = 65.45 mm^3

Hence, the iterative solution will be as next:

  • i = 1, ti = 0, Vi = 65.45

V'_{i}  = -k *4pi*(\frac{3*65.45}{4pi})^(2/3)  = -6.283\\V_{i+1} = 65.45-6.283*0.25 = 63.88

  • i = 2, ti = 0.5, Vi = 63.88

V'_{i}  = -k *4pi*(\frac{3*63.88}{4pi})^(2/3)  = -6.182\\V_{i+1} = 63.88-6.182*0.25 = 62.33

  • i = 3, ti = 1, Vi = 62.33

V'_{i}  = -k *4pi*(\frac{3*62.33}{4pi})^(2/3)  = -6.082\\V_{i+1} = 62.33-6.082*0.25 = 60.813

We compute the next iterations in MATLAB (see attachment)

Volume @ t = 10 is = 20.2969

The droplet radius at t=10 mins

r(10) = (\frac{3*20.2969}{4pi})^(2/3) = 1.692 mm\\

The average change of droplet radius with time is:

Δr/Δt = \frac{r(10) - r(0)}{10-0} = \frac{1.692 - 2.5}{10} = -0.0808 mm/min

The value of the evaporation rate is close the value of k = 0.08 mm/min

Hence, the results are accurate and consistent!

5 0
3 years ago
Urgent !!!!!!!!!!!!!!! 10 points
Mademuasel [1]

Answer:

136 cm²

Step-by-step explanation:

Surface area = 2(lw+wh+hl)

l = 7

w = 2

h = 6

so,

2(7×2+2×6+7×6)

= 136 cm²

6 0
2 years ago
Read 2 more answers
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