3 years ago

A submarine at a depth of -25 2/3feet descended 5 1/3. How many feet must the submarine rise to reach the surface?

Mathematics

1 answer:

zheka24 [161]3 years ago

7 0

Answer:

it descended 31 Feet b b b b b b b b b bb b b b b b b b b b b

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Rewrite the function by completing the square f(x)=x^2-4x-26

leonid [27]

Answer:

(x - 2)² - 30

Step-by-step explanation:

To complete the square

add/subtract ( half the coefficient of the x- term )² to x² - 4x

f(x) = x² + 2(- 2)x + 4 - 4 - 26 = (x - 2)² - 30

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2 years ago

Simplify (-63) ÷ (-9)

Julli [10]

Dividing two negatives equals a positive:
(-63) / (-9) = 7

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What is the value of x to the nearest tenth? A. 6.0 B. 13.4 C. 26.8 D. 30.0

lilavasa [31]

Use the Pythagorean theorem:

$\left(\dfrac{1}{2}x\right)^2+12^2=18^2\\\\\dfrac{1}{4}x^2+144=324\ \ \ |-144\\\\\dfrac{1}{4}x^2=180\ \ \ \ |\cdot4\\\\x^2=720\to x=\sqrt{720}\\\\\boxed{x\approx26.8}$

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3 years ago

(15–7xy^2)–(y^3–y^2x–15)

Vitek1552 [10]

My answer is: -6xy2 - y3 + 30
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3 years ago

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A certain drug is made from only two ingredients: compound A and compound B. There are 3 milliliters of compound A used for ever

Sphinxa [80]

Answer:

$304\dfrac{4}{7}\ milliliters$

Step-by-step explanation:

If there are 3 milliliters of compound A used for every 4 milliliters of compound B, then we can denote that we use 3x milliliters of compound A and 4x milliliters of compound B to get 533 milliliters of the drug. Thus,

$3x+4x=533,\\ \\7x=533,\\ \\x=\dfrac{533}{7}\ milliliters.$

Hence, a chemist must take

$4\cdot \dfrac{533}{7}=\dfrac{2132}{7}=304\dfrac{4}{7}\ milliliters$

of compound B.

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2 years ago

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