Answer:
21
Step-by-step explanation:
factors of 42: 1,42, 2,<u>21</u>, 3,14, 6,7
factors of 63: 1,63, 3,<u>21</u>, 7,9
86 years old because you subtract 2017-1931
F(x) = 1, so we make the entire equation equal 1.
1 = sqrt(x) + 7
To make x by itself subtract 7 from both sides
-6 = sqrt(x)
Square both sides to remove sqrt from x.
36 = x
The value of x is 36
