This is the concept of trigonometry, the height of the tree will be given by:
tan theta=[opposite]/[adjacent]
theta=80
height=h
adjacent=5 m
hence;
tan80=h/5
hence;
h=5tan80
h=28.36 m
Yes because if you multiply 332 with 39 to get how much bricks you need, it will be 12,948. 15,000 is more than 12,948 so it is enough
We claim that the answer is 
Since the two graphs both open down, and all the answer choices, in addition to the equation of the blue graph, are quadratic polynomials, the leading coefficient must be negative. This immediately rules out answer choices A, B, and C, leaving D as the answer.
Answer:
The axis of symmetry for the question on the left is X=2
The axis of symmetry for the question on the right is X=3 :)
This is the graph for the one on the right:
1/5 + 3/4= (1/5 multiply numerator and denominator by 4, 3/4 by 5. Hence you get the following)
4/20 + 15/20
= 19/20
1- 19/20 = 1/20
