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3 years ago

How do I sole this problem step by step 1/2y - 9 = -6

Mathematics

2 answers:

julsineya [31]3 years ago

8 0

1/2 y= 9-6
1/2y= 3
Y= 6

elena55 [62]3 years ago

3 0

Answer:Learn

Step-by-step explanation:

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What is the value of f? −18f−34−14f=11

andriy [413]

Just finished the test :D. The answer would be -31 1/3

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2 years ago

The figure shows triangle DEF and line segment BC, which is parallel to EF: Triangle DEF has a point B on side DE and point C on

Svetlanka [38]

Part A:
-Yes because the are have the same angles and are the same shape.

Part B:
-Line segment BC corresponda to line segment EF.

Part C:
-Angle D corresponds with angle F. They are on the same line.

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3 years ago

A large fish tank at an aquarium needs to be emptied so that it can be cleaned. When its

VikaD [51]

Answer:

The draining time when only the big drain is opened is 2.303 hours.

The draining time when only the small drain is opened is 5.303 hours.

Step-by-step explanation:

From Physics, we know that volume flow rate ( $\dot V$ ), measured in liters per hour, is directly proportional to draining time ( $t$ ), measured in hours. That is:

$\dot V \propto \frac{1}{t}$

$\dot V = \frac{k}{t}$ (Eq. 1)

Where $k$ is the proportionality constant, measured in liters.

From statement, we have the following three expressions:

(i) Large and small drains are opened

$\dot V_{s}+\dot V_{l} = \frac{k}{2}$ (Eq. 2)

$\frac{\dot V_{s}+\dot V_{l}}{k} = \frac{1}{2}$

(ii) Only the small drain is opened

$\dot V_{s} = \frac{k}{t_{l}+3}$ (Eq. 3)

$\frac{\dot V_{s}}{k} = \frac{1}{t_{l}+3}$

(iii) Only the big drain is opened

$\dot V_{l} = \frac{k}{t_{l}}$ (Eq. 4)

$\frac{\dot V_{l}}{k} = \frac{1}{t_{l}}$

By applying (Eqs. 3, 4) in (Eq. 2) and making some algebraic handling, we find that:

$\frac{1}{t_{l}+3}+\frac{1}{t_{l}} = \frac{1}{2}$

$\frac{t_{l}+t_{l}+3}{t_{l}\cdot (t_{l}+3)} = \frac{1}{2}$

$2\cdot t_{l}+3 = t_{l}^{2}+3\cdot t_{l}$

$t_{l}^{2}-t_{l}-3 = 0$ (Eq. 5)

Whose roots are determined by the Quadratic Formula:

$t_{l,1}\approx 2.303\,h$ and $t_{l,2} \approx -1.302\,h$

Only the first roots offers a solution that is physically reasonable. Hence, the draining time when only the big drain is opened is 2.303 hours. And the time needed for the small drain is calculated by the following formula:

$t_{s} = 2.303\,h+3\,h$

$t_{s} = 5.303\,h$

The draining time when only the small drain is opened is 5.303 hours.

7 0

3 years ago

What's the most effective method for controlling inventory ? a ) Electronically , by reviewing billing receipts b ) Electronical

mina [271]

Answer:

a ) Electronically , by reviewing billing receipts

Step-by-step explanation:

The main purpose of controlling inventory is to make sure that the optimal amount of products are being kept.

Therefore, option A is correct.

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1 year ago

a banana contains 105 chloride last week Brenda and Leo a total of 14 banana how many calories does this represent

egoroff_w [7]

$7 + 7 \div 2$

so both of them ate 7 and means that they both ate 7 ,cause 7+7=14 and since there are 2 of them so divide by 2 ...14÷2=7 so that means they both ate 7 chloride bananas.... not sure

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3 years ago