Well since the triangle is split into 2 triangles and they both are the same size so BD on the bottom is 15 which means naturally BC must be 30. Five I'm not sure about
First,you have to divide and see which number can go into 45 , 15 , and 30 what ever your answer is thats how many of each item you can put on each shelf. In your case it would be 15
Answer:
Part 1) 
Part 2) 
Step-by-step explanation:
step 1
Find the value of x
In the right triangle of the figure
---> opposite side angle of 30 degrees divided by the hypotenuse
Remember that

substitute
solve for x


step 2
Find the value of y
In the right triangle of the figure
---> adjacent side angle of 30 degrees divided by the hypotenuse
we have


substitute


A is correct due to the smaller interquartile range