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3 years ago

9 + 10 = nine plus ten equals?

Mathematics

1 answer:

8090 [49]3 years ago

3 0

Answer:

Step-by-step explanation:

9+10=19

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The perimeter of a rectangle is 28 cm and its length is 8 cm. Find its breadth.

Yakvenalex [24]

Answer:
The width of the rectangle is 6cm.

Explanation:
Perimeter=2(length+width)
28=2(8+w)
Distribute 2 into the parentheses
28=16+2w
Combine like terms
28-16=2w
12=2w
Divide both sides by 2
6=w

I hope this helps! Please comment if you have any questions.

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3 years ago

There was 1 liter of water in the water bottle. Tom drank 200 milliliters of water. How many liters of water are left?

Lorico [155]

Answer:

.8 L or 800 ML

Step-by-step explanation:

1000 ML in a L, 1000-200 = 800.

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3 years ago

Read 2 more answers

A piece of ribbon is 12/15m long. A piece of 4/15 m is cut from it. What is the fraction

nignag [31]

Answer:

8/15

Step-by-step explanation:

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2 years ago

Julie has 4/3 cups of flour.She needs 2/5 cups of flour.How will she get the amount.

valentina_108 [34]

Answer:

Step-by-step explanation:

You need to set up a ratio for the original recipe and then use that ratio for the new one.

If we need 3 cups of flour for every 4 cups of sugar, we have a 3 c flour/4 c sugar ratio, or 3/4

The new ratio is 9 c of flour for ? c of sugar. Those ratios have to be the same, so we set up an equation like this:

3/4 = 9/?

In order to keep the same ratio, you have to multiply by the same number. Since 3*3 = 9, multiply 4*3 to get your answer.

8 0

3 years ago

Find the equation of the tangent of x^2- xy + y^2 =7 at (-1, 2)

Citrus2011 [14]

Answer:

It is 3y = 4x + 10

Step-by-step explanation:

Let's first get the slope of the curve.

[ slope is the derivative of the equation ]

${x}^{2} - xy + {y}^{2} = 7$

introduce dy/dx :

$\frac{d}{dx} ( {x}^{2} - xy + {y}^{2} ) = \frac{d}{dx} (7) \\ \\ 2x - (y + \frac{dy}{dx} ) + 2y \frac{dy}{dx} = 0$

make dy/dx the subject:

$2x - y - \frac{dy}{dx} + 2y \frac{dy}{dx} = 0 \\ \\ 2y \frac{dy}{dx} - \frac{dy}{dx} = y - 2x \\ \\ \frac{dy}{dx} (2y - 1) = y - 2x \\ \\ \frac{dy}{dx} = \frac{y - 2x}{2y - 1}$