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navik [9.2K]
3 years ago
11

Three times a number increased by eight is no more than a number decreased by four

Mathematics
1 answer:
Westkost [7]3 years ago
3 0

Answer:

x is no more than -6

Step-by-step explanation:

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A developer was buying land. He bought 4 acres at $1,863 per acre. He then spilt the land he purchased into 9 lots. How much sho
Tpy6a [65]

Answer:

$1862 ÷9=$207(each lot)

$207 ×4=$828

5 0
3 years ago
Solve the system.
Alex777 [14]

Answer:

{x,y,z} = {-18,4,2}

Step-by-step explanation:

Solve equation [2] for the variable  x  

x = -10y + 2z + 18

Plug this in for variable  x  in equation [1]

(-10y+2z+18) + 9y + z = 20

- y + 3z = 2

Plug this in for variable  x  in equation [3]

 3•(-10y+2z+18) + 27y + 2z = 58

   - 3y + 8z = 4

Solve equation [1] for the variable  y  

 y = 3z - 2

Plug this in for variable  y  in equation [3]

  - 3•(3z-2) + 8z = 4

   - z = -2

Solve equation [3] for the variable  z  

 z = 2

By now we know this much :

 x = -10y+2z+18

   y = 3z-2

   z = 2

Use the  z  value to solve for  y  

 y = 3(2)-2 = 4

Use the  y  and  z  values to solve for  x  

 x = -10(4)+2(2)+18 = -18

6 0
2 years ago
Cos2a= 2cos^2a-1 for all values of a<br><br> true or false?
Law Incorporation [45]
True
<span>Cos(A+B)=CosACosB-SinASinB
therefore Cos(A+A)= CosACosA - SinASinA
= Cos^2A - Sin^2A</span>
5 0
3 years ago
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What is the slope of the line given by the equation y = 12x?
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Answer:

up 12 over 1

Step-by-step explanation:

8 0
3 years ago
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The pH level of tomato juice is 4.2. What is the hydrogen-ion concentration [H+]| for tomato juice?
garri49 [273]

Given:

pH = 4.2 of tomato

Required:

hydrogen-ion concentration [H+]| for tomato juice

Solution:

The formula for the pH relating hydrogen ion concentration is pH = -log[H+] where H+ is the hydrogen ion concentration. so, substitute the value of pH

pH = -log[H+]

4 = - log[H+]

-4 = log[H+]

10^-4 = [H+]

[H+] = 1x10^-4M

4 0
2 years ago
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