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natita [175]
3 years ago
11

On a​ map, 1 inch equals 5 miles. Two cities are 3 inches apart on the map. What is the actual distance between the​ cities?

Mathematics
1 answer:
Genrish500 [490]3 years ago
6 0

Answer:

15

Step-by-step explanation:

cross multiplying, \frac{1}{5} × \frac{3}{x}

then it would be 15 =1x

and 1x is basically just one, so 15 = x

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3 years ago
Evaluate the surface integral. S xz ds, s is the part of the plane 2x 2y z = 4 that lies in the first octant
maksim [4K]

The value of the given surface integral is 4.

The given plane intercepts the coordinate axes at (2, 0, 0), (0, 2, 0), and (4, 0, 0). These point are the coordinates of a triangular region that we can parameterize using.

S(u,v)=(1-u)((1-u)(2,0,0)+u(0,2,0)+u(4,0,0)\\S(u,v)=(2(1-u)(1-v),2u(1-v),4v)

<h3>What is the surface integral?</h3>

A surface integral is a generalization of multiple integrals to integration over surfaces. It can be thought of as the double integral analog of the line integral. Given a surface, one may integrate a scalar field over the surface or a vector field.

with 0≤u≤1 and  0≤v≤1. Then the surface element ds  is equivalent to

ds=\||\:\left(s_u\times \:\:S_v\right)||dudv=12\left(1-v\right)dudv

The surface integral is then

\int \:\int \:_Sxzds=12\int _0^1\:\int _0^1\:\left(2\left(1-u\right)\left(1-v\right),2u\left(1-v\right),4v\right)dvdu=4

Therefore the value of the given surface integral is 4.

To learn more about the integral visit:

brainly.com/question/14295614

#SPJ2

6 0
2 years ago
Can someone help me please, ill give brainy
MrRa [10]

Answer:

x = -6

Step-by-step explanation:

The value of x never changes, no matter what the value of y is, so x = -6 describes every point on the line.

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Step-by-step explanation:

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Step-by-step explanation:

how to help people that helps

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