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The coefficient of x^2 is 18.

Close.

For column 2 two, the sum is 8 and the shaded square is 4, which would be 50% not 66 1/3%.

Sorry, on the second example that was wrong, I ment is 6 75% of 9 not 12. And that would be wrong anyway because 75% of 9 is not 6.

\(\begin{array}{ccc} 2 & 1 & 3 \\ 2 & 4 & 2 \\ 1 & 3 & 4 \end{array}\)

Incorrect.

One example is on the bottom row, 1 2 1 wouldn't be valid because their sum is 4. and the shaded square would be the one on the far left, which must be 50% of the sum un that row. 1 is not 50% of 4. It would be 2.

There were a couple more errors too. Is 6 75% of 12? No, it would be 9.

Keep trying!

The area of triangle DEF is 108.

Here is the answer:

6 4 8

2 7 9

1 2 1

10 + 5 sqrt 3         and      10 - 5 sqrt 3

oops...

x = 16.5

Angles are:    A = 86º       B = (3x + 28)º          C = (x)º

86 + (3x + 28) + x = 180

x + 16.5

b=20-a

"Write an expression for the sum of their squares."

a^2+b^2

=

now do the substitution and then simplify.

Initially

k = 1.25 j

then

k -96  =  1/2 (j+ 96)        sub in the red equation

1.25j   - 96 = 1/2 (j + 96)

.75 j = 144

j = 192          then k = 240

Expected value    (3 * 8  +   2*6)/10 = 3.6

with one additional '6'

(3*8 + 3*6 ) /11 = 3.82

You can probably find the answer here which is answered by EP.

https://web2.0calc.com/questions/help-algebra_149

I used your tip and im stuck. I got:

a+b=20

10+10=20

and..

b=20-a

10=20-10

So when it asks "Write an expression for the sum of their squares, in terms of a." I wrote b=20-a and 10=20-10 but the answer still is wrong. Do you know where i was wrong?

This is a incomplete question becuase after "integer value of a" it then skips to "does the equation."

Angle AYX = 180 - 1/2(180 - 80)

1. The expected value would be 3 since there are more slips of paper of a 3 then a 6.

I will start you off.

a+b=20

b=20-a

The answer is 14/9

Your right, but you forgot to divide by 4, since he said b = 3c+28 and you add another c, due to it being b(3c+28) + c

oops, I missed the ratio of angles.  Disregard my above.  Sorry.  

_.

a = 86

b = 3c + 28

c?

a+b+c = 180

b+c = 94

b+c = 4c+28

4c+28 = 94

4c = 66

c = 16.5

Hope this helped!