Hi,
The answer will be

.
Now how is that, there is a rule for the right angled triangle which says:
cosθ =

so, if we applied this rule on the lower triangle we can say: cos30°=

and therefore the hypotenuse =

=

.
now in the upper triangle we will apply the same rule so,
cos45°=

and the adjacent side in the upper triangle is

and the hypotenuse is x.
so cos45°=

and then we can say
x=

=

.
Answer:
54.4
Step-by-step explanation:
g(20) = 19.6 + 1.74 (20)
g(20) = 19.6 + 34.8
g(20) = 54.4
Maybe another day in the life of who knows what im talking about
Complementary angles --- they add up to 90 degrees