Do long division but the answer is 2/7 or 0.2857
        
             
        
        
        
84. Area of a triangle is (base x height) / 2
 
        
             
        
        
        
Answer:
answer: he spent $120
Step-by-step explanation:
20×5=100
100+ the initial $20 spent = $120
 
        
             
        
        
        
Answer:
y= -7
Step-by-step explanation:
y=ax+b
Find a where a=y2-y1 /x2-x1 
y2=13,y1=5 x2=5,x1=3
substituting the values 
a=13-5/5-2
a=8/2
a=4
substituting a into the formular 
y=4x+b
taking x and y values let say 3 and 5 for x and y
the equation becomes 
5=4(3)+b
5=12+b
5-12=b
-7=b
 substituting the values of a and b into the equation
y=4x-7 
when x=0
y=4(0)-7
y=0-7
y=-7 
so when x=0,y=-7