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2 years ago

6

How many solutions does this system of equations have

1 answer:

viva [34]2 years ago

3 0

The solution is x=2 y=6. First,you have to rearrange the second equation then rewrite it under the other one. Then, solve for y using elimination. Finally, plug y in to the original to solve for x. It has one solution.

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You buy the same number of brushes, rollers and paint cans. Write an expression in simples form that represents the total amount

jeyben [28]

T= 21.79x + 3.99x + 6.89x where t is the total cost and x is the number of brushes/rollers/paint cans you buy. You don't need a different variable for each item because you buy the same amount of each.

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2 years ago

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A blueprint of a shopping complex shows the bottom edge of the roof to be 93 feet above the ground. If the roof

bezimeni [28]

Slope = (rise) / (run)

Rise = (171-93) = 78 ft

Run = 6.5 yards = 19.5 ft

Slope = (78 / 19.5)

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4 0

2 years ago

Suppose that surface σ is parameterized by r(u,v)=⟨ucos(3v),usin(3v),v⟩, 0≤u≤7 and 0≤v≤2π3 and f(x,y,z)=x2+y2+z2. Set up the sur

Bad White [126]

Looks like you have most of the details already, but you're missing one crucial piece.

$\sigma$ is parameterized by

$\vec r(u,v)=\langle u\cos3v,u\sin3v,v\rangle$

for $0\le u\le7$ and $0\le v\le\frac{2\pi}3$ , and a normal vector to this surface is

$\dfrac{\partial\vec r}{\partial u}\times\dfrac{\partial\vec r}{\partial v}=\left\langle\sin3v,-\cos3v,3u\right\rangle$

with norm

$\left\|\dfrac{\partial\vec r}{\partial u}\times\dfrac{\partial\vec r}{\partial v}\right\|=\sqrt{\sin^23v+(-\cos3v)^2+(3u)^2}=\sqrt{9u^2+1}$

So the integral of $f(x,y,z)=x^2+y^2+z^2$ is

$\displaystyle\iint_\sigma f(x,y,z)\,\mathrm dA=\boxed{\int_0^{2\pi/3}\int_0^7(u^2+v^2)\sqrt{9u^2+1}\,\mathrm du\,\mathrm dv}$

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2 years ago

The town of worman grove has collected 28,481 pens for school supplies drive. Their goal is 30,000 pens .Show how to use countin

frosja888 [35]

Answer:

1519

Step-by-step explanation:

if wrong super sooryyyyy :(

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1 year ago

One subtracted by negative three

timama [110]

-2 you just subtract the 3 by 1

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8 0

3 years ago

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