Need on !

15. which of the following is a straight angle ?
a)
b)
c)
d)

16. if m (angle) hoi = 21 and m (angle) goi = 47, then what is the measure of (angle) goh ?

15. a,    16. ∠GOH = 26

Step-by-step explanation:

15. A straight angle looks as a line.

16. ∠GOI = ∠GOH + ∠HOI

47 = ∠GOH + 21

∠GOH = 47 - 21 =26

∠GOH = 26

for this case we have by definition, if two lines are perpendicular, then the product of their slopes is -1.

then, given the following line:

so,

we are looking for m_ {2}:

then, the line is given by:

we find "b" replacing the given point:

finally, the equation is:

option c

=

x=0.8898305 is the answer to that equation