I guess he needs to save $4 more to buy the shoes
        
             
        
        
        
Looks like a badly encoded/decoded symbol. It's supposed to be a minus sign, so you're asked to find the expectation of 2<em>X </em>² - <em>Y</em>.
If you don't know how <em>X</em> or <em>Y</em> are distributed, but you know E[<em>X</em> ²] and E[<em>Y</em>], then it's as simple as distributing the expectation over the sum:
E[2<em>X </em>² - <em>Y</em>] = 2 E[<em>X </em>²] - E[<em>Y</em>]
Or, if you're given the expectation and variance of <em>X</em>, you have
Var[<em>X</em>] = E[<em>X</em> ²] - E[<em>X</em>]²
→   E[2<em>X </em>² - <em>Y</em>] = 2 (Var[<em>X</em>] + E[<em>X</em>]²) - E[<em>Y</em>]
Otherwise, you may be given the density function, or joint density, in which case you can determine the expectations by computing an integral or sum.
 
        
             
        
        
        
I’m pretty sure it would be 1/5, because scaling is changing the y values of the function. If the y value of the original is 10, you need to multiply/scale the new one by 1/5 to get the y value of 2
        
                    
             
        
        
        
Answer:
   −3x > 24
Step-by-step explanation:
Adding 10 to both sides of the inequality will give the missing step:
   -3x -10 +10 > 14 +10
   -3x > 24
 
        
                    
             
        
        
        
Answer:
Rotate triangle A  by 180° and then translate triangle A 5 units to the right. After this, Dilate it by a scale factor of "2"