**Answer:**

x=-224/229,

y=296/229,

z=118/229

**Step-by-step explanation:**

-5x-7y-4z=-6

6x+2y+3z=-2

-x+2y-7z=0...........( multiple with (-5) and sum with 1st equation, mult with 6 and sum with 2nd equation)

______________

-x+2y-7z=0

-17y+31z=-6.....(mult with 14)

14y-39z=-2.....(mult with -17) then sum

___________

-x+2y-7z=0

-229z=-118, so here we have z=118/229.

14y-39*(118/229)=-2, from here we have y=296/229

-x+2*(296/229)-7*(118/229)=0, we get that x=-234/229

In the same way you can do this in the matrix form>>

STEAM = 48 and MAST = 44 , this can also be written as S+T+E+A+M = 48 and M+A+S+T = 44 so STEAM - MAST = 48 - 44 = 4 ,so now we know the value for E , TEA = 27 so knowing E equals TA = 23 ,MAST - TA = 44 - 23 = 21 = MS , STEM - MS - E = T = 36 - 21 - 4 = 11 , TA - T = A = 23 - 11 = 12, SEA - A - E = S = 22 - 11 - 4 = 7, STEM - S - T - E = 36 - 7 - 11 - 4 = 14 = M ,

so now after all that we know that ,

E = 4

S = 7

T = 11

A = 12

M = 14

so ESTEEM = 4 + 7 + 11 + 4 + 4 + 14 = 44

**Answer:**

B

**Step-by-step explanation:**

C=pi×d

C÷pi = Pi×d÷Pi

C/pi=d

Answer: y= 1/2x - 3

I tried to explain as much as possible in the attachment .

20% is equal to 0.2

0.2 times 26.40 is equal to 5.28

26.40 minus 5.28 is equal to 21.12