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ladessa [460]
3 years ago
10

Help me please 2t = 10

Mathematics
2 answers:
Black_prince [1.1K]3 years ago
8 0
Divide both sides by 2

2t/2 = 10/2


t=5
CaHeK987 [17]3 years ago
4 0

Answer: t = 5

Step-by-step explanation:

If 2t = 10, then we divide 10 by 2. The answer is 5.

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An ellipse (by Kepler in 16th century) 
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It takes nora two hours to paint a wall 5m by 8m, and zack three hours to paint a wall 4m by 9m. together, how long will it take
Zolol [24]
Nora's speed (5*8)m²/2h= 20 m²/h.
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Given area  (10*12)m²=120 m²

120m² *1h/32m² = 3.75 h (3h 45 min) to paint 10m*12m together.

3 0
4 years ago
The shaded region R in diagram below is enclosed by y-axis, y = x^2 - 1 and y = 3.
Lostsunrise [7]

Cross sections of the volume are washers or annuli with outer radii <em>x(y)</em> + 1, where

<em>y</em> = <em>x(y) </em>² - 1   ==>   <em>x(y)</em> = √(<em>y</em> + 1)

and inner radii 1. The distance between the outermost edge of each shell to the axis of revolution is then 1 + √(<em>y</em> + 1), and the distance between the innermost edge of <em>R</em> on the <em>y</em>-axis to the axis of revolution is 1.

For each value of <em>y</em> in the interval [-1, 3], the corresponding cross section has an area of

<em>π</em> (1 + √(<em>y</em> + 1))² - <em>π</em> (1)² = <em>π</em> (2√(<em>y</em> + 1) + <em>y</em> + 1)

Then the volume of the solid is the integral of this area over [-1, 3]:

\displaystyle\int_{-1}^3\pi y\,\mathrm dy = \frac{\pi y^2}2\bigg|_{-1}^3 = \boxed{4\pi}

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8 0
3 years ago
What’s the answer to this ?
Katen [24]

Answer:

4th one

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if you add them

7 0
3 years ago
(2x+y=-2<br> 5x + 3y = -8<br> Solve by elimination
Effectus [21]

Answer:

y = -6, x =2

Step-by-step explanation:

To solve by elimination, you have to line both equations up together. Then, you multiply both equations until one variable is removed.

2x+y = -2

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There are many different ways to solve an elimination problem, but generally you should look for the simplest route. Here, I would multiply the top equation by -3.

-6x -3y = 6

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Imagine you are adding the two equations together. You end up with

-x = -2

Then solve for x. In this situation, it is fairly simple. Take out a factor of -1.

x = 2

Finally, choose one of your beginning equations and plug your new-found x value back into the equation.

2(2) +y = -2

4 + y = -2

y = -6

8 0
3 years ago
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