Please help Is the quotient 2x^4/7 ÷ 5x^4/4 defined for x= 0?

If n stands for number sold and c stands for cost per item, in which column would you use the formula: ? a. column d c. column f b. column e d. column g

Issof claims that the scale factor is 1/2. which statement about his claim is correct

9/10 divide by -3/15 as a mixed number