59.4cm
Use Pythagorean theorem to find the diagonal (^ means exponent)
a^2 + b^2 = c^2
42^2 + 42^2= c^2
1764+1764=c^2
3528=c^2
square root both sides
c= 59.39696962
round and you get 59.4 cm
Let's solve and find out.
4(2n - 4) + 3 = 8n - 19
8n - 16 + 3 = 8n - 19
8n - 13 = 8n - 19
-13 = -19
-13 and -19 are not equal, so the equation has no solutions.
Answer:
A. 0

so.. to get every angle, simply plug in 10 for "x" for each.
Answer:
Given expression :
......[1]
Using distributive property: 
[1]⇒ 
Simplify:

Like terms are those terms which are same variables.
Combine like terms: we get;
......[2]

Simplify:
or
we can write equation [2] as;
Combine like terms of x variables;
Therefore, the expressions which are equivalent to the Given expression are:

The answer is 2.2 .... hope this helps!! :D