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liq [111]
3 years ago
13

-7z - 7 ≤ -5z + 5 need help sloving

Mathematics
2 answers:
V125BC [204]3 years ago
7 0
-7z - 7 ≤ -5z + 5

- 7 - 5 ≤ -5z + 7z
-12 ≤ 2z
-12/2 ≤ z
-6 ≤ z or z>= -6
Lostsunrise [7]3 years ago
6 0
This is an inequality problem. The way to solve this is to treat the inequality sign (<, >, etc) like an equal sign (=). 

-7z - 7 = -5z + 5

first, you get rid of the constants (the numbers that don't have variables with them)
the way to do that is to perform reverse operations (when there is a negative, add. when positive, subtract. same for multiplying and dividing)

-7z - 7 = -5z + 5
     + 7          + 7
------------------------
      -7z = -5z + 12

the sevens are cancelled out because of the + and the - on both of them, and 5+7 is 12. 
now, for the coefficients. you do the same process.

-7z - 7 = -5z + 5
     + 7          + 7
------------------------
      -7z = -5z + 12
     +5z    +5z
-------------------------
      -2z = 12

now that you have combined all the alike terms, you divide until the variable is by itself. (/ is divide)

-7z - 7 = -5z + 5
     + 7          + 7
------------------------
      -7z = -5z + 12
     +5z    +5z
-------------------------
      -2z = 12
      /-2     /-2
-----------------------
        z = -6

twelve divided by -2 is -6. so, z = -6.
now all you have to do is switch out the inequality sign: z < -6
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wlad13 [49]
Hello,

To find the percentage, simply divide the smaller number to the larger number. In this situation, we divide 608 million by 845 million, which will get you:
0.719526627219. At this point, move the decimal place 2 places to the right to get the percent form of the decimal. Let's also round this decimal up.

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3 years ago
A person on a moving sidewalk travels 40 feet in 8 seconds. The moving sidewalk has a length of 200 feet. How long will it take
beks73 [17]

Answer:

The man covers 200 ft in 40 seconds.

Step-by-step explanation:

A person is moving on the sidewalk from one end to the other end.

He walks 40 feet in 8 seconds.

Therefore his speed = \frac{distance covered}{time}

                                   = \frac{40}{8}

                                   = 5 ft/s^{2}

He covers the sidewalk distance at a rate of 5 feet every second.

To calculate the time taken to cover 200 ft,

time = \frac{distance to be covered}{speed}

time =\frac{200}{5}

<u>time  = 40 seconds</u>

Hence the man covers 200 ft in 40 seconds.

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If the measure of angle 1 is 110 degrees and the measure of angle 3 is (2 x + 10) degrees, what is the value of x?
user100 [1]

Answer:

Correct option is

B

90

∘

,90

∘

,90

∘

Let AB and CD be two lines Intersecting at O, such that, ∠AOD=90

∘

Now, ∠AOD=∠COB=90

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⟹∠AOD+∠DOB=180

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Thus, all angles are 90

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2 years ago
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