2.5n = 8 what is the value of n in this solution

A n=3.2
B n=10.5
C n=5.5
D n=20

If cos(2x) = tan^2(y), show that cos(2y) = tan^2(x).

Let f(x) = 5/x and g(x)=2x2+5x. what two numbers are not in the domain of f o g

❤️ (geometry) does the construction demonstrate how to copy an angle correctly using technology a) yes; the distance between points a and f was used to create circle h b) yes; the distance between points f and g was used to create circle h c)no; the distance between points a and f was used to create circle h d) no; the distance between points f and g was used to create circle h