We need a picture of the lines
She can get 21 portions. Since 2/3 and 42/3 already share the same denominator, all you need to do is divide 42 by 2 to get 21.
notice the first term is -10, and the common difference is 3, so we add 3 to get the next term.
check the picture below.
Answer:
The question is asking which combinations of 
make different types of equations. y=2x^2 makes a quadratic equation, y=-4x+1 makes a linear equation, and y=1 makes a horizontal line
78’ degrees on the right side
