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Tom [10]
3 years ago
10

Can some one help me ?????

Mathematics
2 answers:
scoundrel [369]3 years ago
6 0
\frac{6}{7}v-\frac{7}{4}=-\frac{3}{2}|\cdot28\\
24v-49=-42\\
24v=7\\
v=\frac{7}{24}
gizmo_the_mogwai [7]3 years ago
4 0
\frac{6}{7}v-\frac{7}{4}=-\frac{3}{2}\ \ \ \ \ |multiply\ both\ sides\ by\ LCM(7;\ 4;\ 2)=28\\\\28\times\frac{6}{7}v-28\times\frac{7}{4}=28\times(-\frac{3}{2})\\\\4\times6v-7\times7=14\times(-3)\\\\24v-49=-42\ \ \ \ \ \ |add\ 49\ to\ both\ sides\\\\24v=7\ \ \ \ \ \ |divide\ both\ sides\ by\ 24\\\\\boxed{v=\frac{7}{24}}

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Plz help me with this
FrozenT [24]

Answer:

the answer is b

Step-by-step explanation:

3 0
3 years ago
A student spends 12% of his or her money on a book. After buying the book, the student has $120.12 left.
dezoksy [38]

Answer:

$136.50

Step-by-step explanation:

100 - 12 = 88% (How much percentage of money the student left)

88% = 120.12

1% = 120.12 ÷ 88 = 1.365

Before buying the book, the student had 100%

100% = 1.365 x 100 = 136.50

5 0
3 years ago
a cuboid with a volume of 924 cm3 has dimensions 4cm (x+1)cm and (x+11)cm. show clearly that x^2 +12x-220=0. show the equation b
nikdorinn [45]

Answer:

Part 1)

The equation by factorization is

x^{2}+12x-230=(x-(-6+\sqrt{266}))(x-(-6-\sqrt{266}))

Both values of x are

x1=-6+\sqrt{266}

x2=-6-\sqrt{266}

Part 2) The dimensions of the cuboid are

4\ cm, (-5+\sqrt{266})\ cm and (5+\sqrt{266})\ cm

Step-by-step explanation:

step 1

we know that

The volume of the cuboid is equal to

V=LWH

substitute the given values

V=4(x+1)(x+11)

V=924\ cm^{3}

so

4(x+1)(x+11)=924\\4(x^{2}+11x+x+11)=924\\ 4(x^{2}+12x+11)=924\\x^{2}+12x+11=231\\x^{2}+12x-230=0

Complete the square

x^{2}+12x-230=0

x^{2}+12x=230

x^{2}+12x+36=230+36

(x+6)^{2}=266

square root both sides

x+6=(+/-)\sqrt{266}

x=-6(+/-)\sqrt{266}

so

x1=-6+\sqrt{266}

x2=-6-\sqrt{266}

therefore

The equation by factorization is

x^{2}+12x-230=(x-(-6+\sqrt{266}))(x-(-6-\sqrt{266}))

step 2

Find the dimensions of the cuboid

The dimensions are

4\ cm

(x+1)\ cm -----> (-6+\sqrt{266}+1)=(-5+\sqrt{266})\ cm

(x+11)\ cm ----> (-6+\sqrt{266}+11)=(5+\sqrt{266})\ cm

4 0
3 years ago
Read 2 more answers
Can someone plsssss help
Taya2010 [7]

Answer:

12

Step-by-step explanation:

a2 +b2 = c2

a2 + 9 2 = 15 2

a2 + 81 = 225

     - 81    - 81

a2 = 144

 a = 12

4 0
4 years ago
Read 2 more answers
Instructions
Anuta_ua [19.1K]

Step-by-step explanation:

Drag the empty jar to the lake to get a water sample  

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3. Put the “1” and “2” labels on each beaker  

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Take the pH meter to Beaker 2 and record the pH and description in Table B

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The reason that this hypothesis is correct is when you have more mass, you have more energy. So, when you drop let's say a baseball, it isn’t that heavy so it would only launch the bean bag so far. But a bowling ball is very heavy and has lots of energy when falling because of that, it would make the bean bag go very high.  

To make this experiment better, I would use a smoother material for the lever so energy wouldn’t be lost by friction from wood rubbing together. Also, maybe a scanner or video camera to more accurately record how far the bean bag went. All of these would help the lab get more precise results, maybe they could be used in a future lab.

7 0
3 years ago
Read 2 more answers
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