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2 years ago

ILL MARK BRAINLIEST PLEASE HELP DUE SOON!

Mathematics

1 answer:

navik [9.2K]2 years ago

3 0

Answer:

all i know is length x width x height

Step-by-step explanation:

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It takes a landscaper 75 minutes to plant a tree. He spent a total of 450 minutes planting trees

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Answer:

450 divided by 75 = t

he plated 6 trees

Step-by-step explanation:

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3 years ago

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A rectangular piece of gift wrap is 5.5 inches in length and 2.1 inches in width. What is the area of the gift wrap?

Nina [5.8K]

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2 years ago

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Lin bought 4 bags of apples. Each bag had the same

sashaice [31]

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I do not see any diagrams. Though she had 32 apples before she ate any, 8 in each bag.

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3 years ago

Evaluate the integral by changing to polar coordinatesye^x dA, where R is in the first quadrant enclosed by the circle x^2+y^2=2

34kurt

$\displaystyle\iint_Rye^x\,\mathrm dA=\int_{\theta=0}^{\theta=\pi/2}\int_{r=0}^{r=5}r^2\sin\theta e^{r\cos\theta}\,\mathrm dr\,\mathrm d\theta$

which follows from the usual change of coordinates via

$\begin{cases}\mathbf x(r,\theta)=r\cos\theta\\\mathbf y(r,\theta)=r\sin\theta\end{cases}$

and Jacobian determinant

$|\det J|=\left|\begin{vmatrix}\mathbf x_r&\mathbf x_\theta\\\mathbf y_r&\mathbf y_\theta\end{vmatrix}\right|=|r|$

Swap the order, so that the integral is

$\displaystyle\int_{r=0}^{r=5}\int_{\theta=0}^{\theta=\pi/2}r^2\sin\theta e^{r\cos\theta}\,\mathrm d\theta\,\mathrm dr$

and now let $\sigma=r\cos\theta$ , so that $\mathrm d\sigma=-r\sin\theta$ . Now, you have

$\displaystyle\int_{r=0}^{r=5}\int_{\sigma=0}^{\sigma=r}re^\sigma\,\mathrm d\sigma\,\mathrm dr=\int_{r=0}^{r=5}r(e^r-1)\,\mathrm dr=4e^5-\dfrac{23}2$

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3 years ago

(Write an equivalent expression by applying the distributive property X+2)(x+9)

ivann1987 [24]

Answer:

Step-by-step explanation:

(x + 2)(x +9)= x*(x +9) + 2*(x +9)

= x*x + x*9 + 2*x + 2*9

= x² + 9x + 2x + 18 {Combine like terms}

= x² + 11x +18

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2 years ago

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