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irinina [24]
3 years ago
13

A model aeroplane costs £3.40. James gets a special deal. When he buys two airplane, he saves 20% of the total price. How much d

oes he save altogether
Mathematics
1 answer:
max2010maxim [7]3 years ago
3 0
The answer is $1.36 because you have to add $3.40+3.40 because he buys two airplanes. Afterwards you multiply times .20 and get 1.36 because you always have to move 20% two places to the left

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Calculate the double integral. $$\iint_{R}{\color{red}4} xye^{x^{2}y}\hspace*{3pt}dA, \quad R = [0, 1] \times [0, {\color{red}7}
Lady_Fox [76]

Answer:

\mathbf{\int \int _R \ 4xy e^{x^2 \ y}  \ dA =  2 (e^7 -8)}

Step-by-step explanation:

Given that:

\int \int _R 4xye^{x^2 \ y} \ dA, R = [0,1]\times [0,7]

The rectangle R = [0,1] × [0,7]

R = { (x,y): x ∈ [0,1] and y ∈ [0,7] }

R = { (x,y): 0 ≤ x ≤ 1 and 0 ≤ x ≤ 7 }

\int \int _R \ 4xy e^{x^2 \ y}  \ dA = \int^{7}_{0}\int^{1}_{0} 4xye^{x^2 \ y} \ dx dy

\int \int _R \ 4xy e^{x^2 \ y}  \ dA = \int^{7}_{0} \begin {bmatrix} ye^{yx^2} \dfrac{4}{2y} \end {bmatrix}^1 _ 0 \ dy

\int \int _R \ 4xy e^{x^2 \ y}  \ dA = \int^{7}_{0} \begin {bmatrix} ye^{y1^2} \dfrac{4}{2y} - ye^{y0^2} \dfrac{4}{2y} \end  {bmatrix}\ dy

\int \int _R \ 4xy e^{x^2 \ y}  \ dA = \int^{7}_{0} \dfrac{4}{2}(e^y -1) \ dy

\int \int _R \ 4xy e^{x^2 \ y}  \ dA =  \dfrac{4}{2}[e^y -1]^7_0 \ dy

\int \int _R \ 4xy e^{x^2 \ y}  \ dA =  2 [(e^7 -7)-(e^0 -0)]

\int \int _R \ 4xy e^{x^2 \ y}  \ dA =  2 [(e^7 -7)-1]

\mathbf{\int \int _R \ 4xy e^{x^2 \ y}  \ dA =  2 (e^7 -8)}

3 0
4 years ago
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DENIUS [597]

Answer:

it is a 55% decrease

(why do i have to type at least twenty characters, just send the answer omg)

8 0
3 years ago
Todd has created the following diagram to prove the Pythagorean theorem. He drew right
aalyn [17]

Answer:

  cx +cy = a² + b²

Step-by-step explanation:

In the end, he wants to show that c² = a²+b², so he will want to form the sum a²+b². That sum can be formed by adding the expressions for a² and b² just found:

  cx +cy = a² + b² . . . . . . . Todd's next step

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Then the following steps are ...

  c(x+y) = a² + b²

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7 0
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Kryger [21]
X= the total questions
x×20%=16. 20%=0.2
so x×0.2=16

solve for x and that is your answer; )
8 0
3 years ago
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Answer:

c

Step-by-step explanation:

because it is a outlier we can assume these 2 things:

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because we know this, we can now solve the problem

both the median and mean decreased, but the mean decreased more than the median

7 0
3 years ago
Read 2 more answers
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