3 years ago

Can someone please help me with my math homework I really need help plzzz answer as soon as possible

Mathematics

1 answer:

Flura [38]3 years ago

6 0

Sorry the Q dosent show all in the image

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Write ( 7 x 1 ) + ( 4 x 1 /10 ) + ( 6 x 1 /1000 ) in standard form place value

Alexeev081 [22]

Answer:

7.406

Step-by-step explanation:

7.406 in standard form

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3 years ago

Can someone teach me how to solve this please

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30x + 20y +55 ANSWER ASAP

vazorg [7]

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3 years ago

Find the volume of the solid whose base is the circle x2+y2=25 and the cross sections perpendicular to the x-axis are triangles

ivanzaharov [21]

Triangles with height $h$ and base $b$ , with $b=h$ have area $\dfrac{b^2}2$ .

Such cross sections with the base of the triangle in the disk $x^2+y^2\le25$ (a disk with radius 5) have base with length

$b(x)=\sqrt{25-x^2}-\left(-\sqrt{25-x^2}\right)=2\sqrt{25-x^2}$

i.e. the vertical (in the $x,y$ plane) distance between the top and bottom curves describing the circle $x^2+y^2=25$ .

So when $x=4$ , the cross section at that point has base

$2\sqrt{25-16}=6$

so that the area of the cross section would be 6^2/2 = 18.

In case it's relevant, the entire solid would have volume given by the integral

$\displaystyle\int_{-5}^5\frac{b(x)^2}2\,\mathrm dx=4\int_0^5(25-x^2)\,\mathrm dx=\frac{1000}3$

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3 years ago

I need to find the area of the shaded part. I have the height of the triangle. But I dont know how to get the base of the triang

GalinKa [24]

Well, it is bass times height divided by two

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3 years ago