Slope formula: 
Slope of line one: 
Slope of line two: 
Slope of line three: 
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You could say “you had 18 t-shirts and bought 12 more and now you have a total of 30 t-shirts”
-4^4= -4*-4*-4*-4
-4*-4=16
16*-4=-64
-64*-4= 256
Final answer: 256
First you make them mixed numbers:
9/2 ÷ 19/8
Then you flip the second fraction around
9/2 ÷ 8/19
Then you change ÷ to ×
9/2 × 8/19
And then multiply across!
72/38 = 1 34/38 = 1 17/19 (the final answer)
Hope this helps!