The curve y= (1-x)/(x-3) is concave up when:

Step-by-step explanation:

The given function is

To find where the function is concave up, we have to find the second derivative of the function.

The derivative of a fraction is

Where and .

Using the property, we have

Then, we repeat the process to find the secon derivative

For a concave up inflection, we must evalute

Therefore, the curve is concave up when .

In the image attached you can observe this behaviour.

ad = ae + ed = y + 7

similar triangles therefor

ac/ab = ad/ae

6/4 = (y + 7) / y

cross multiply

6y = 4(y + 7)

6y = 4y + 28

2y = 28

y = 14

step-by-step explanation:

answer: when you burn wood, the carbon reacts with the oxygen in the air to create ash and smoke. that is a permanent change you cannot undo that.

step-by-step explanation: