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Ilia_Sergeevich [38]
2 years ago
9

Please help I’m very confused I will mark brainliest

Mathematics
1 answer:
olya-2409 [2.1K]2 years ago
5 0

Answer:

A. j > 11

B. x ≥ 8

Step-by-step explanation:

For A if 7j is greater than 77, then j has to be more than 11. 7 x 11= 77.

For B x has to be greater or equal to 17, and 8+9 is equal to 17.

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A cylindrical water tank has a diameter of 5.3 meters and a height of 9 meters. What is the maximum volume that the water tank c
atroni [7]

Answer:

198.56m^{3

Step-by-step explanation:

To find the volume of a cylinder, you need to find the area of the cross-section (one of the circles on the side) and multiply it by the length.

Area of the circle = πr^{2} = π x (5.3/2) x (5.3/2) = π x 2.65 x 2.65 = 7.0225π

Volume of the cylinder = 7.0225π x 9 = 63.2025π = 198.56m^{3

8 0
2 years ago
HELP PLEASE DUE IN 3 MINUTES
Anarel [89]

Answer:

101

Step-by-step explanation:

If you add up all of the answers, it equals 101 due to the fact of just adding all of the x's together in a row.

6 0
2 years ago
Suppose that 48% of people own dogs. If you pick two people at random, what is the probability that they both own a dog?
katovenus [111]
12/25 chance that they both own a dog
8 0
1 year ago
When two computers are working together, they can finish updating software in 9 minutes. How long would they take individually t
tensa zangetsu [6.8K]
First computer takes x min. For 1 min it does 1/x part of work.

Second computer takes (x+24) min. For one min it does 1/(x+24) part of work.

Both computers for one min do   (1/x+1/(x+24)) part of work.

At the same time, both computers for one min do 1/9 part of work.

\frac{1}{x} + \frac{1}{x+24} = \frac{1}{9} 
\\ \\  \frac{x+24+x}{x(x+24)} =  \frac{1}{9} 
\\ \\9(2x+24)=x^{2} +24x
\\ \\ 18x+216=x^{2} +24x
\\ \\ x^{2}+6x-216=0
\\ \\ D=b^{2}-4ac=36+4*216 = 900
\\ \\ x= \frac{-b+/- \sqrt{D} }{2a}  =  \frac{-6+/-30}{2} 
\\ \\ x_{1}=-18, x_{2}=12

We can use only positive number here. So, 

for the first computer x=12 min,

 for second computer x+24=12+24= 36 min

Answer 12 min and 36 min.


7 0
3 years ago
How do you find surface area ? i don't remember. also new friends :) ?
Montano1993 [528]

Answer:

be my bestie

Step-by-step: The surface area is the number of square units that fit into the square. As shown in the picture, the surface area of this square is 16 total square units. With a rectangle and square we can also get the surface area by multiplying width (W) x length (L).tep explanation:

4 0
3 years ago
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