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3 years ago

I’m sorry about the quality but questions 6-9! anything helps :)

Mathematics

1 answer:

kati45 [8]3 years ago

7 0

Answer:

Hi! The answer is in the picture! *They're color coded*

Step-by-step explanation:

☆*: .｡..｡.:*☆☆*: .｡..｡.:*☆☆*: .｡..｡.:*☆☆*: .｡..｡.:*☆

☁Brainliest is greatly appreciated!☁

Hope this helps!!

- Brooklynn Deka

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1. On a 20 question test, Sarah got 2 questions wrong. What percent of the test does he have correct?

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Answer:

1=90%

Step-by-step explanation:

20-2=18, 18/20=90%

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3 years ago

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the length of a rectangular pool is three times its width. The perimeter of the rectangular pool is 168 feet. find the length an

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Step-by-step explanation:

breadth = 21 m

length = 63 m

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3 years ago

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The Richter scale is used to measure the magnitude of an earthquake. The magnitude, R, is given by the earthquake. Determine the

8090 [49]

A) $R=0.65log(0.39E)+1.45

7.5=0.65log(0.39E)+1.45$

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3 years ago

A piece of cardboard measures 10 ft by 10 ft. Four equal squares of size x are removed from the corners. After removing the squa

Gnesinka [82]

Answer:

The value of x would be $\frac{5}{3}$

Step-by-step explanation:

Given,

The dimension of the cardboard = 10 ft by 10 ft,

∵ After removing four equal squares of size x ( in ft ) from the corners,

The dimension of the resultant box would be,

Length = ( 10 - 2x ) ft,

Width = ( 10 - 2x ) ft,

Height = x ft,

The volume of box,

$V=(10-2x)\times (10 - 2x)\times x=x(10-2x)^2 = x(100 - 40x + 4x^2)=100x - 40x^2 + 4x^3$

Differentiating with respect to x,

$V'=100 - 80x + 12x^2$

Again differentiating with respect to x,

$V''=-80 + 24x$

For maxima or minima,

$V'=0$

$\implies 100 - 80x + 12x^2 = 0$

$\implies 3x^2 - 20x + 25=0$

By quadratic formula,

$x=\frac{20\pm \sqrt{20^2-4\times 3\times 25}}{6}$

$x=\frac{20\pm \sqrt{400 - 300}}{6}$

$x=\frac{20\pm \sqrt{100}}{6}$

$x=\frac{20\pm 10}{6}$

$\implies x = \frac{10}{6}=\frac{5}{3}\text{ or } x = 5$

For x = 5/3, V'' = negative,

While for x = 5, V'' = Positive,

Hence, the value of x would be 5/3 ft for maximising the volume.

8 0

3 years ago

EVERYONE, PLEASE HELP I NEED THIS DONE

zimovet [89]

Answer:

$\frac{4}{5}$

Step-by-step explanation:

$\frac{32}{40}$

Both 32 and 40 are divisible by 8.
32÷8=4

40÷8=5

Thus, the simplest form is $\frac{4}{5}$

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2 years ago

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