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MAVERICK [17]
3 years ago
6

What is the value of z in the equation 2z + 7 = -5? a. -6 b. -1 c. 1 d. 6

Mathematics
2 answers:
Mekhanik [1.2K]3 years ago
4 0
2z +7 = -5

2z = -5 -7

2z = -12

z= -12 /2

z= -6
Alina [70]3 years ago
4 0

Answer:

-6

Step-by-step explanation:

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Solve the equation by completing the square.Round to the nearest hundredth if necessary. X^2–x–7=0
lesya [120]
NOTE:  \left(x-\dfrac{1}{2}\right)^2=x^2-x+\dfrac{1}{4}

x^2-x-7=0 \\ \\ \underbrace{x^2-x+\frac{1}{4}}_{\left(x-\frac{1}{2}\right)^2}-7\dfrac{1}{4}=0 \\ \\  \\ \left(x-\frac{1}{2}\right)^2=7\frac{1}{4}=\frac{29}{4} \qquad /\sqrt{}\\ \\  \left|x-\frac{1}{2}\right|=\dfrac{\sqrt{29}}{2} \\ \\  x_1=\dfrac{1}{2}-\dfrac{\sqrt{29}}{2} \approx  -2.19 \\ \\ x_2=\dfrac{1}{2}+\dfrac{\sqrt{29}}{2} \approx 3.19

ANSWER:  c)

5 0
3 years ago
Elliot has a total of 26 books. He has 12 more fiction books than nonfiction books. Let x represent the number of fiction books
inysia [295]

Luckily for us, this problem solved the bulk of its own question!


Now, all we have to do is solve for "x", or the amount of fiction books and plug its value back into the original equation to find the value of "y", or the amount of nonfiction books.


2x = 38

x = 19

There are 19 fiction books.

x + y = 26

19 + y = 26

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Hope this helps!

7 0
3 years ago
Read 2 more answers
Decrease 52 by 8.5%<br> maths deceasing percentages
Anastasy [175]
52-8.5\%\cdot52=52-0.085\cdot52=52-4.42=47.58
5 0
3 years ago
What type of graph represents the solutions to the problem y=2x+4
horrorfan [7]
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lilavasa [31]

Answer:

Density of the material is 5 grams per cubic centimeter.

Step-by-step explanation:

The answer is required to be given in grams per cubic centimeter.

So we should first convert the values to match the units.

Mass is given as 2500 grams so we don't need to change the units.

Volume is given in cubic centimeters. So we don't need to change the units.

Density      = [ Mass of the material / Volume of the Solvent]

                  =2500 grams / 500 cubic centimeters

                  =5 grams per cubic centimeter

6 0
3 years ago
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