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3 years ago

Seven subtracted from twice a number given 17, find this number.

Mathematics

1 answer:

ch4aika [34]3 years ago

7 0

Answer:

The number should be 12.

Step-by-step explanation:

We can form a simple equation and solve for the variable:

2x - 7 = 17

2x = 24

x = 12

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A pump can fill a swimming pool in 8 hours. The pool also has a drain that can empty the pool in 10 hours. If someone turns on t

cluponka [151]

Answer:

40 hours will it take for the pool to fill.

Step-by-step explanation:

A pump can fill a swimming pool in 8 hours.

Work done by pump to fill in 1 hour is $\frac{1}{8}$

The pool also has a drain that can empty the pool in 10 hours.

Work done by pump to drain in 1 hour is $\frac{1}{10}$

If someone turns on the pump to fill the pool, but forgets to shut the drain.

Work done by both pipe in 1 hour is

$W=\frac{1}{8}-\frac{1}{10}$

$W=\frac{10-8}{80}$

$W=\frac{2}{80}$

$W=\frac{1}{40}$

Both pipe filled $\frac{1}{40}$ part of pool in hours = 1

Both pipe filled complete pool in hours = $\frac{1}{\frac{1}{40}}=40$

Therefore, 40 hours will it take for the pool to fill.

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3 years ago

A construction crew is lengthening a road. The road started with a length of 54 miles, and the crew is adding 4 miles to the roa

scoray [572]

L = 4D + 54 <== ur equation

the crew worked for 31 days...so sub in 31 for D

L = 4(31) + 54
L = 124 + 54
L = 178 miles <==

5 0

3 years ago

Evaluate 31 2x when x=4

larisa86 [58]

2x=8
so, 31*2x=31*8=248

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3 years ago

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If a < b where on the line will a appear

kow [346]

Less than were the b is.

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3 years ago

An eagle is soaring 155 meters above sea level while a blue shark is swimming 445 meters below sea level. How far are these two

maw [93]

Answer:

610 meters

Step-by-step explanation:

-455 is where the shark is we wanna go to sea lvl so we gotta add 455

+455

155 is where the agle is, we add 155 because shark is now at sea lvl

155+455=610

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2 years ago