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2 years ago

100 POINTS!!! WILL MARK BRAINLIEST FOR CORRECT ANSWER AND STEP BY STEP EXPLANATION! PLEASE ANSWER BOTH QUESTIONS

Mathematics

2 answers:

liraira [26]2 years ago

7 0

Answer:

840 $cm^{2}$

Step-by-step explanation:

8×6×15=720

5×6×4=120

720+120=840

3241004551 [841]2 years ago

6 0

Answer:

V= 840cm^3, V=800cm^3

Step-by-step explanation:

First you want to calculate the volume of the entire imaginary prism, 12×15×6

=1080,

afterwards you want to calculate the missing volume, which you can think of as a bite. First, find the sides.

12-8=4 5-15=10

Now calculate the volume of the bite, 4×10×6

=240

Now take the bite out of the sandwich, 1080-240

= 840

Follow the same steps, though this time the sides of the "bite" are given.

10×12×8

= 960

4×5×8

= 160

960-160 = 800 cm

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Naya [18.7K]

Okay so first off the equation of a line is
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The Y intercept of this line is 2 and the slope is 5/3! You know this is the slope because if you start at point a and go up 5 and to the right 3, you end up at point b.

The equation for this line would be y=5/3x+2

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3 years ago

Which of the following expressions is correct?

masya89 [10]

Answer:

The correct answer is: [A]: " -(-21) = 21 " .

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Step-by-step explanation:

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Let us examine the answer choices given.

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Choice: [A]: " -(-21) = 21 . This is correct;

→ since a "negative value of negative value" is a "positive value" ; as shown in this case. The equal sign holds true, since the

"negative of a "negative value" is equal to the "positive value" of that same "positive value equivalent."

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Choice: [B]: " -(-21) = -21 . This is incorrect. As explained above:

→ a "negative of negative" is a "positive value" .

This answer choice shows that a "negative of negative"; is a "negative" :

→ which is: INCORRECT.

→ Rule out: "Choice: [B]."

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Choice: [C]: " -(21) = 21 . This is incorrect. The "negative" value [of a positive integer is not equal to the "equivalent positive value" of that same integer.

→ Rule out: "Choice: [C]."

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Choice: [D]: " (-21) = 21 "; This is incorrect. In a conceptually similar way as explained above—(for "Answer Choice: [C]" — the "negative value equivalent" of an integer is NOT equal to the "equivalent positive value" [of that same integer.].

→ Rule out: "Choice: [D]."

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The correct answer is: [A]: " -(-21) = 21 " .

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Hope this is helpful to you!

Best wishes!

7 0

3 years ago

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4. The reflecting dish of a parabolic microphone has a cross-section in the shape of a parabola. The microphone itself is placed

elixir [45]

Assume the parabola is placed on a graph where the x-axis is the top of the dish.
The vertex is then at (0,-30) The x-intercepts or zeros are at (-30,0) and (30,0)

The equation of such parabola would be:
$y = a(x+30)(x-30)$
Plug in vertex to find value of 'a'
$-30 = a(0+30)(0-30) \\ \\ a = \frac{-30}{(-30)(30)} = \frac{1}{30}$

Now find the focus given that $p = \frac{1}{4a}$
$p = \frac{1}{4(1/30)} = \frac{30}{4} = 7.5$

Answer: the microphone should be placed 7.5 inches from vertex.

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3 years ago

Please help me as I need this by today

sdas [7]

The system shown at the right has no solution, as the grahs never intersect.
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3 years ago

What is 28% of 58?<br><br> Hhhhhhh

Olenka [21]

Answer:

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Change to decimal form

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3 years ago

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