Answer:
see explanation below 
Step-by-step explanation:
1500 × 3 × 20 ÷ 100
$900 
 
        
             
        
        
        
Answer: Chet is 6 years old now
Step-by-step explanation:
Chet is 6 years old now and his father is 5 x 6 years = 30 years old now.
In 6 years, Chet will be 12 years old, so his father will be 3 x 12 years old = 36 years old.
 
        
             
        
        
        
        
Answer:
y+1 = -1(x+10)
Step-by-step explanation:
The point slope equation of a line is 
y-y1 = m(x-x1) where m is the slope  and (x1, y1) is a point on the line
y - -1 = -1 (x --10)
y+1 = -1(x+10)
 
        
                    
             
        
        
        
Answer:

Step-by-step explanation:
![\sf{3[ x + 3(4x - 5)]  = 15x - 24}](https://tex.z-dn.net/?f=%20%5Csf%7B3%5B%20x%20%2B%203%284x%20-%205%29%5D%20%20%3D%2015x%20-%2024%7D)
Distribute 3 through the parentheses
⇒![\sf{3[ x + 12x - 15 ]  = 15x - 24}](https://tex.z-dn.net/?f=%20%5Csf%7B3%5B%20x%20%2B%2012x%20-%2015%20%5D%20%20%3D%2015x%20-%2024%7D)
Collect like terms : 12x and x
⇒![\sf{3[ 13x - 15 ]  = 15x - 24}](https://tex.z-dn.net/?f=%20%5Csf%7B3%5B%2013x%20-%2015%20%5D%20%20%3D%2015x%20-%2024%7D)
Distribute 3 through the parentheses
⇒
Move 15x to left hand side and change it's sign
Similarly, move 45 to right hand side and change it's sign
⇒
Collect like terms
⇒
Calculate
⇒
Divide both sides of the equation by 24
⇒
Calculate
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Hope I helped!
Best regards! :D