Answer:

Step-by-step explanation:

Answer:b
Step-by-step explanation:
Answer:
There are two possibilities:
and 
and 
Step-by-step explanation:
Mathematically speaking, the statement is equivalent to this 2-variable non-linear system:


First,
is cleared in the first equation:

Now, the variable is substituted in the second one:

And some algebra is done in order to simplify the expression:


Roots are found by means of the General Equation for Second-Order Polynomials:
and 
There are two different values for
:






There are two possibilities:
and 
and 
Step-by-step explanation:
they forget the last step which is to take the square root of the sum
7) a = 4
b = 17
a² + b² = c²
4²+ 17² = c²
16 + 289 = c²
305 = c²
√305 = c
17.464249196572980 = C