<span>An irrational number can be written as a decimal, but
not as a fraction. An irrational number has endless non-repeating
digits to the right of the decimal point.Hope this helps!!</span>
<span>C = AB + D
AB = C - D
B = (C-D)/A
B = C/A - D/A</span>
<span>9.80 this is what i got
</span>
Answer:

Step-by-step explanation:
The given triangle is a right angle triangle .
The known sides of the triangle that is opposite to angle y is 8 units while the side adjacent is 10 units.
The value of y can be calculated using the tangent ratio.

We solve for y to get,

We evaluate to obtain,

to the nearest degree