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klio [65]
3 years ago
12

Solve the system by elimination: 4x+7y=-1 8x-4z=36 6y-4z=-22

Mathematics
1 answer:
alina1380 [7]3 years ago
7 0
X =5 y = -3 z= 1
Hope this helps :)
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Someone help me please
Mazyrski [523]

Answer:

x = -7

Step-by-step explanation:

The whole line is 12

the whole line is also   x + 14  and  x + 12

  so make them equal:

      x+14     +      x +12     = 12  

       2x   + 26   = 12        now subtract 26 from both sides

               2x = - 14           now divide both sides by 2

                 x = -7

5 0
1 year ago
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A circular garden has a circumference of 42.3 feet. Find the approximate diameter of the garden. Use 3.14 for π.
tamaranim1 [39]

Answer:

13.5

Step-by-step explanation:

c = 2πr

42.3 = 2(3.14)r

42.3 = 6.28r

6.74 = r

d = r + r

d = 6.74 + 6.74

d = 13.5

6 0
2 years ago
An investor invested a total of $2500 in two mutual funds. One fund earned a 5% profit while the other earned a 3% profit. If th
7nadin3 [17]

Answer:

$500 and $2000

Step-by-step explanation:

Let x represent the total investment = $2500

also, this total is split into two different funds

Lets represent these funds as a and b, such that fund a yields a profit of 3% and fund b yield a profit of 5%

So,

a + b = x

a + b =  2500   ......eq 1

Profit from each fund gives;

0.03 a + 0.05b = 115     ....eq 2

Solve simultaneously using substitution method

From eq 1;

b = 2500 - a

Slot in this value in eq 2

0.03a + 0.05 (2500 - a) = 115

expand

0.03a + 125 - 0.05a = 115

collect like terms

0.03a - 0.05a = 115 - 125

-0.02a = -10

Divide both sides by -0.02

a =  $500

Put this value of a in eq 1

500 + b =  2500

Subtract 500 from both sides

b = 2500 - 500

b = $2000

3 0
3 years ago
Your friend has owned a dog for 35 weeks. This is five weeks less than twice as long as he has owned a cat. How long has your fr
pashok25 [27]

Answer:

20 weeks

Step-by-step explanation:

35+5=40

40/2=20

6 0
3 years ago
Which of the following is a true statement about the symmetry of this figure?
katovenus [111]
It has line symmetry and rotational symmetry, so A is the answer, hope this helps
4 0
3 years ago
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