Y varies directly as x. if x=5 when y=12 find x when y=30

Answers

Answer 1

Answer: I guess "varies directly" means that if, for example, you take x=6 you get y=13 or for x=4 y is 12.
Assuming this, you get:
$x_1 = 5 \n y_1 = 12 \n y_2 = 30 \n x_2 = ? \n \n x_2 - x_1 = y_2 - y_1 \n x_2 = x_1 + y_2 - y_1 \n x_2 = 5 + 30 - 12 \n x_2 = 23$
The logic would fit, I guess :/

Answer 2

Answer:

Answer: The equation is y=k(x). So 12=k(5), divide by 5 on both sides coming up with k=2.4. Plug 2.4 in as k in the original equation, making it 30=2.4(x), divide both sides by 2.4, 30 divided by 2.4 is 12.5, making x=12.5

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Step-by-step explanation:

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What is 4,720 round to the nearest thousand

Answers

The answer would be 5,000

5,000 because 720 rounds to 1,000 and so that is the zeroes for 5,000 and it makes sense.

Carla earns $13 an hour cleaning house. How much will she earn if she works from 8:00 to 2:00?

Answers

8pm to 2am, or 8am to 2pm, either way, Carla would've worked for 6 hours.

6*$13=$78

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Carla would earn $78 if she were to clean for 6 hours.

If Carla worked 6 hours and earned $13 an hour. All you need to do is multiply

13 x 6 = 78

So, Carla would have earned $78.00 for working the 6 hours.

Hope this helps you. :-)

What's the greatest whole number that rounds to 621,860

Answers

The greatest whole number that number that rounds to 621,860 is 621,864

3 is 20% of what number

Answers

First: (20/100)x = 3
Second: 20x / 100 = 3
Third: 20x = 3 * 100
Fourth/Final: x = 3*100/ 20 = 15
Answer:
15

Hi!

3 ⇒ 20%
x ⇒ 100%

20x = 3·(100)
20x = 300
x = 300/20
x = 30/2
x = 15

Answer:

3 is 20% of 15

Guy is pouring a new patio for his house. He rents a concrete mixer for $50 per day plus $12.50 per hour. If he is charged $143.75, how long did guy have the concrete mixer?

Answers

Answer:

Step-by-step explanation:

50 + 12.50h = 143.75....where h = # of hrs

12.50h = 143.75 - 50

12.50h = 93.75

h = 93.75 / 12.50

h = 7.5 (or 7 1/2) hrs <====

72-(63-8) and (72-63)-8

Answers

The Priority is always to parenthesis. It means that in both equations, begin by operating what's inside the parenthesis. Then Subtract what's left.

For the first one you get:
$72 - (63-8)$
$72 - 55$
$17$

For the second one you get:
$(72-63)-8$
$9-8$
$1$

Which mean that The 2 equations are not equal, because $17 \ \textgreater \ 1$
Hope this Helps! :D

They are not equal because for each you get different answer.

$72-(63-8) \n 72-55 \n 17$

$(72-63)-8 \n 9-8 \n 1$

17 and 1 are not equal.

Therefore, the two expressions 72-(63-8) and (72-63)-8 are not equal .

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