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3 years ago

If 2+12=18, find the value of 3−13.

Mathematics

2 answers:

s344n2d4d5 [400]3 years ago

8 0

Answer:

Answer is 10

Step-by-step explanation:

if in subtraction if the bigger digit is front of smaller digit then the answer was always start with - signs here the question is 3-13 so biggest digit is 13 and the signs is - so here 10 is the answer hope it is helpful to you all so please like

mojhsa [17]3 years ago

6 0

Answer:

-10

Step-by-step explanation:

3-13=-10

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A storage box with a square base must have a volume of 90 cubic centimeters. the top and bottom cost $0.60 per square centimeter

Paul [167]

Answer-

For side length of 3.56 cm and height of 7.10 cm the cost will be minimum.

Solution-

Let us assume that,

x represents the length of the sides of the square base,

y represent the height.

Given the volume of the box is 90 cm³, so

$\Rightarrow V=90\\\\\Rightarrow x^2\times y=90\\\\\Rightarrow y=\dfrac{90}{x^2}$

As the top and bottom cost $0.60 per cm² and the sides cost $0.30 per cm². Total cost C will be,

$C=\text{cost for top and bottom}+\text{cost for rest 4 sides}\\\\=(2x^2\times 0.6)+(4xy\times 0.3)\\\\=(2x^2\times 0.6)+(4x\times \frac{90}{x^2}\times 0.3)\\\\=1.2x^2+ \dfrac{108}{x}$

Then,

$C'=\dfrac{d}{dx}(1.2x^2+ \dfrac{108}{x})=2.4x-\dfrac{108}\\\\C''=\dfrac{d^2}{dx^2}(1.2x^2+ \dfrac{108}{x})=2.4+\dfrac{216}{x^3}$

As C'' has all positive terms so, for every positive value of x (as length can't be negative), C'' is positive.

So, for minima C' = 0

$\Rightarrow 2.4x-\dfrac{108}{x^2}=0\\\\\Rightarrow 2.4x=\dfrac{108}{x^2}\\\\\Rightarrow x^3=\dfrac{108}{2.4}=45\\\\\Rightarrow x=3.56$

Then,

$y=\dfrac{90}{x^2}$

$y=\dfrac{90}{3.56^2}$

$y=7.10$

Therefore, for side length of 3.56 cm and height of 7.10 cm the cost will be minimum.

4 0

4 years ago

Read 2 more answers

Jonah has a piece of string that is 70 inches long. He cuts the string into 6 equal pleces. How many Inches long is each piece o

Zolol [24]

Answer:

11.66666666

Step-by-step explanation:

70 divided by 6

6 0

3 years ago

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Semenov [28]

Answer: baby 5

Step-by-step explanation:

I dont know 5+5 = baby 5

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3 years ago

The ratio of the measures of the three angles in a triangle is 14:5:11. Find the value of x

Lilit [14]

Answer:

The three angles are 84º, 30º, and 66º. You multiply the ratio 14:5:11 by 6º.

Step-by-step explanation:

The sum of a triangle's interior angles is 180º. From the information we know:

14xº+5xº+11xº=180º
Combine like terms, 30xº=180º
Divide, xº=6º

Now we can say that the three angles are 14(6)=84º, 5(6)=30º, 11(6)=66º.

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3 years ago

Stephen does not like yogurt very much, but he loves

Mrac [35]

5+2+3=10 total snacks
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4 years ago