A deposit can be filled by two keys. One poured 140 liters in 8 minutes and the other 130 liters in 7 minutes. How long it will take to fill the tank, drain being empty and closed?, if the two keys are open at the same time, knowing that its capacity is 400 liters?

Answers

Answer 1

Answer: its a matter of calculating the two speeds of filling and then add them together.
speed1 = 140 liters / 8 minutes = 17.5 liters per minute
speed2 = 130 liters / 7 minutes = 18.57 liters per minute
So we'll open both keys with speed1 and speed2, x amount of minutes, and fill 400 liters, if we write an equation of these statement that is:
17.5x + 18.57x = 400
solve for x!
36.07x = 400
x = 11.09
therefore it will take 11.09 minutes to fill the 400 liters tank with both keys open.

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Plz help A right triangle has legs with lengths 7 cm and 24 cm.What is the length of the hypotenuse?

Answers

C²=A²+B²
C²= 7² + 24²
C²= 49 + 576
C²= 625
C=√625
C=25

Answer:

C = 25 Centimeters

A can of 3 tennis balls sells for $2. If Sal spent more than $24 on tennis balls, which inequality can be used to find n, the number of tennis balls Sal could have bought? Two-thirds n greater-than 24 Three-halves n greater-than 24 2 n greater-than 24 3 n greater-than 24.

Answers

Answer:

Step-by-step explanation:

i just did the test

If the temperature at 8:00a.m.
was 22°F,
and at 4:00
p.m.
the same day, it was
–2°F,
what was the average temperature decrease
per hour during this period?

Answers

$From\ 8:00\ am\ to\ 4:00\ pm\ there\ is\ 8\ hours\n\n22-(-2)=22+2=24F\n\n24:8=3\n\nTemperature\ decrease\ 3F\ per\ hour.$

Answer:

22F

Step-by-step explanation:

What is the range in the number 11, 10, 12, 16, 15, 18

Answers

Answer:

subtract the smallest number from the largest number

Find the mean of the following: 158, 213, 107, 213, and 213. If needed, round your answer to the nearest tenth

Answers

Answer:

180.8

Step-by-step explanation:

1. Add all the numbers

2. Divide the sum by 5

3. you get the answer

Answer:

180.8

Step-by-step explanation:

If the point (7, 3) is on the graph of an equation, which statement must be true?A. The values x = 3 and y = 7 make the equation true.
B. The values x = 7 and y = 3 are the only values that make the equation true.
C. There are solutions to the equation for the values x = 7 and x = 3.
D. The values x = 7 and y = 3 make the equation true.

Answers

Answer:

The value of x=7 and y=3 make the equation true.

D is correct.

Step-by-step explanation:

If the point (7, 3) is on the graph of an equation.

If point lie on any graph then the value of x and y satisfy the equation. It means equation would be true for the given passing point.

First value of point is x and second value is y

For given point: (7,3)

x=7 and y=3

If we put x=7 and y=3 in the graph of the equation then equation must be true.

because it makes equation true.

For true equation left side must be equal to right side.

Hence, The value of x=7 and y=3 make the equation true.

The best answer would be D. because:
1) x = 7 and y = 3 in that specific coordinate
2) if the point is on the graph and is labeled it is 1 of the MANY solutions that make that specific equation true

There is a chance for B. but if its infinate then (7,3) couldn't be the ONLY coordinate that makes it true

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