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liubo4ka [24]
3 years ago
5

WILL MARK BRAINLIEST!!

Mathematics
1 answer:
Dafna1 [17]3 years ago
3 0

Answer:

h = 9

Step-by-step explanation:

volume = \pi \:  {r}^{2} h \\  1,386 =  \frac{22}{7}  \times 7 \times 7 \times h \\ 1,386 = 154 \times h \\ h =  \frac{1,386}{154}  \\ h = 9

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6. 3x - 2y = 19<br> x + y=8.
EastWind [94]

Answer:

3x - 2y = 19

x + y=8.

rewrite

-2y=-3x+19

-2y=2x-16

-3x+19=2x-16

+3x

19=5x-16

+16

35=5x

x=7

y=1

Hope This Helps!!!

3 0
3 years ago
Read 2 more answers
Need help rn 30 points
Ilia_Sergeevich [38]

Answer: X = (-\frac{5}{4}\\, 6)

Step-by-step explanation:

x(4x - 19) = 30

4x^2 - 19x = 30

4x^2 - 19x - 30 = 0

ax^2 + bx + c = 0

X{1}=  \frac{-b+\sqrt{b^{2} -4ac}}{2a}\\= \frac{19+\sqrt{(-19)^{2} -4(4)(-30)}}{2(4)}\\ = 6

X{2}= \frac{-b-\sqrt{b^{2} -4ac}}{2a}\\=\frac{19-\sqrt{(-19)^{2} -4(4)(-30)}}{2(4)}\\= -\frac{5}{4} = -1.25

X = (-\frac{5}{4}\\, 6)

7 0
3 years ago
Since he's made of metal, Moby weighs a lot. In fact, Tim's weight is only 4 percent of Moby's weight. If Tim weighs 50 kg, how
Ivanshal [37]

Answer:

Moby weighs 1250Kgs

Step-by-step explanation:

Tim is 4% of Moby so

T =4%m

if T is for Tim and Tim weighs 50kgs then

50=4%m

100/4=25

25*50=1250

M = 1250Kgs

8 0
3 years ago
A boy had 72 coins and lost 25% of them How muy coins<br> did he have left?
postnew [5]

Answer:

54 coins left

Step-by-step explanation:

72 x .25 = 18

72 - 18 = 54

8 0
3 years ago
Read 2 more answers
PROBLEM: Four women (Linda, Lisa, Glenda, and Dee) are married to four men (Tom, Duane, Ron, and Ernie). From the clues, determi
UNO [17]

Answer:

How about asking your math teacher for help, instead of going to the internet?  As your math teacher, I think it would be a better idea than having your teacher find your internet post!

Step-by-step explanation:

I'll be waiting for an email.

4 0
3 years ago
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