Answer:
135
Step-by-step explanation:
90 is way to low, it wouldnt keep the trend in a linear line. same for 180, its too high. 150 is already for the 20 students. 135 fits just right.
{x:x is a real number}
Since any value can replace x to give an integer.
63 pizzas can be made
what
-7xy+4x^2-8 and y+1-8x^y