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3 years ago

Solve the equation for x. -x^2+14=10

Mathematics

2 answers:

amid [387]3 years ago

7 0

-x^2= -4 then cancels the minus signs on both sides and square root the 4
x= 2

mariarad [96]3 years ago

4 0

-x^2 + 14 = 10

subtract 14 from each side

-x^2 = -4

divide each side by -1

x^2 =4

square root each side

x = 2

hope this helps!!! :)

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Based on the Egyptian Social Pyramid, which statement below is true?

Novosadov [1.4K]

Answer:

Third Option

Step-by-step explanation:

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3 years ago

what does democracy mean and how do we practice it in the United States of America PLEASE HELPPP!!!!

Maslowich

Answer:

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3 years ago

What are factors of 19,21,23,25

shtirl [24]

19: 1, 19

21: 1, 3, 7, 21

23: 1, 23

25: 1, 5, 25

4 0

3 years ago

Melissa decided to divide her $42,000 of savings into three investments: a savings account paying 5% simple interest, a time dep

Marat540 [252]

Answer:

Amount in savings account = $24,000

amount put into time deposit account = $11,000

amount put into bond account = $7,000

Step-by-step explanation:

Let x be amount put into savings account, y be amount put into time deposit account and z be amount put into bond account.

Thus;

0.05x + 0.07y + 0.09z = 2600 - - (eq1)

Also,

x + y + z = 42,000 - - - (eq2)

Now,we are told she invested 6000 more in the savings account than the other 2 combined. Thus;

x = 6000 + y + z

So,

x - y - z = 6000 - - - (eq3)

Solving the 3 equations simultaneously gives;

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4 years ago

Two workers finished a job in 12 days. How long would it take each worker to do the job by himself if one of the workers needs 1

Lorico [155]

Two workers finished a job in 7.5 days.

How long would it take each worker to do the job by himself if one of the workers needs 8 more days to finish the job than the other worker?

let t = time required by one worker to complete the job alone

then

(t+8) = time required by the other worker (shirker)

let the completed job = 1

A typical shared work equation

7.5%2Ft + 7.5%2F%28%28t%2B8%29%29 = 1

multiply by t(t+8), cancel the denominators, and you have

7.5(t+8) + 7.5t = t(t+8)

7.5t + 60 + 7.5t = t^2 + 8t

15t + 60 = t^2 + 8t

form a quadratic equation on the right

0 = t^2 + 8t - 15t - 60

t^2 - 7t - 60 = 0

Factor easily to

(t-12) (t+5) = 0

the positive solution is all we want here

t = 12 days, the first guy working alone

then

the shirker would struggle thru the job in 20 days.

8 0

3 years ago

Read 2 more answers