Answer: 
Step-by-step explanation:
For this exercise it is necessary to remember the following:
1) The Distributive Property states the following:

2) The multiplication of signs:

Knowing this, and having the following expression given in the exercise:

You can apply the Distributive property multiplying
and
, which are inside the parentheses, by
.
So, you get the following result:

Using the tagent rule:
Tangent(angle) = Opposite Leg / Adjacent leg
Tangent(51) = x / 10
x = 10 * Tangent (51)
x = 12.349
x = 12.3 ( Rounded to the nearest tenth)
Use the formula A= height*base/2
Answer:
0oooo
Step-by-step explanation:
yup