Answer:
a = 
b= 4
Step-by-step explanation:
It's a 30-60-90 triangle based on the given picture. A right triangle too
Use sine, cosine, and tangent to solve for the side.
To find b, you can use sin(30) = b/8 because sin(angle) = opposite/hypotenuse.
OR you can use the rule for 30-60-90 triangle, which is x for short leg, 2x for hypotenuse, and  for long leg
 for long leg
So either way, b = 4
To find a, you can use cos(30) = a/8 because cos(angle) = adjacent/hypotenuse.
OR you can use the same rule, 30-60-90 triangle to save time
a will end up = 
 
        
             
        
        
        
Answer: 12°30’
Step-by-step explanation:
 
        
             
        
        
        
From (0, 0), the points A and D in the graph are at (-1, -1) and (2, -1) respectively.
<h3>How to depict the graph?</h3>
Since the scale factor is 2, every point will be moved twice a distance in both directions. (x and y).
So, multiplying both coordinates by 2, we will get the dilated points.
Hence, A' will be at (2 × (-1), 2 × (-1)) = (-2, -2) and D' will be at (2 × 2, 2 × (-1)) = (4, -2).
Learn more about graph on:
brainly.com/question/19040584
#SPJ1
 
        
             
        
        
        
As the mean is 90 then, the sum of the quantities are.. 
90×4 = 360
the scores you have are 86, 85, 96 
so the answer is.
85+86+96= 262
360-262= 98
 the fourth score is 98.