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IgorLugansk [536]
3 years ago
6

What is the value of z so that -9 and 9 are both solutions of x^2+z=103?

Mathematics
1 answer:
Ira Lisetskai [31]3 years ago
8 0
The answer is C.
x^2 + z = 103x^2 + 22 = 103*Subtract both sides by 22*x^2 + 22 - 22 = 103 - 22x^2 = 81*square root both sides to find x*√x^2 = <span>√81</span>
<span>x = +- 9</span>
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Plz help I need bt tonight
JulijaS [17]

The answer is 25%.

First: work out the difference between the two numbers you are comparing.  

Decrease = Original Number - New Number

35-28=7


Then: divide the decrease by the original number and multiply the answer by 100.  % Decrease = Decrease ÷ Original Number × 100


7÷

28=.25

.25*100=25

<h2>Answer is 25%.</h2>
7 0
3 years ago
4-2 3/5<br>please simplify ​
Novosadov [1.4K]

Answer:

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Step-by-step explanation:

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lyudmila [28]

Answer:

x=-26

Step-by-step explanation:

Subtract 45 from both sides.

-85-45=5x

Simplify  -85-45 to  -130

-130=5x

Divide both sides by 5.

-130/5=x

Simplify 130/5 to 26

-26=x

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3 years ago
SOMEBODY PLEASE FAST HELP!! (view photo, math related)
charle [14.2K]
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4 0
3 years ago
7x5=20+8+<br> Fill in the missing number to make the equation true
antoniya [11.8K]
Answer: 7

step-by-step:
okay so first you do 7*5 which is 35 and 20+8 which is 28

then you get 35=28+x (the x is the ‘missing number’)

to find x you subtract 28 from both sides to keep the equation balanced

35-28=28-28+x

so 35-28 is 7 and 28-28 is 0 so then you have 7=x and your answer is 7

you’re doing algebra but instead of using variables your teacher is saying find the ‘missing number’ haha
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