Answer:
Yea that problem is a bit confusing,
2y should be double of what y is, which is 4x+5
Then 2y says 8x+15, when it should be 8x+10.
I feel bad cause I am sure the teacher is wrong on this, he/she had probably made a typo, or you made a typo, but that's ok! We all make typos!
The teacher would be extra rude if they marked you wrong on this, cause the question itself is not written "properly"
 
        
                    
             
        
        
        
Notice the picture below
the AD line is a bisector, cutting the 36 degrees A in half,
18 and 18 degrees each half
notice the tickmarks, the triangle is an isosceles,
if those two sides are equal, so are the angles they make
down below with the base
now, the base is 8, AD is bisecting that too, to 4 and 4
now, using the Law of Sines

keep in mind, the angles are in degrees, so, when taking the sines, make sure your calculator is in Degree mode
 
        
        
        
Answer:  a. Positive, because the products (3)(-3) and (-2)(4) are negative, and the product of two negative numbers is positive
Step-by-step explanation:  It is also possible to rearrange the factors.
(3)(4) = 12  a positive number.
 (-3)(-2) = 6, a positive number. Again "a negative times a negative is a positive"  --Jaime Escalante, <em>Stand and Deliver</em>
Now you have two positive numbers: 12×6 = 72 
The product is positive either way.
 
        
             
        
        
        
Answer:
286 cubes 
Step-by-step explanation:
Find the area by multiplying the fractions. You get 71 1/2. Divide the area by 1/4 that determines your answer. 
 
        
             
        
        
        
Describe the sample space for this problem: 1200 students at a certain school, all with equal probability of being selected on a random draw.
Which outcome (or outcomes) of the sample space compose the event?
Sophie wins the bike. The chances that that will happen are 1/1200, or 0.00083...