4 to the 9th power over 4 to the 5th power DIVIDE but It is NOT 256 or whatever it is dividing powers PLEASE HELPPP

Question 101 points)which equation in slope-intercept form represents the line that passes through (5, 1) and(-4,7)

Two customers went to a post office. first customer paid $12 for 14 and 5 envelopes the second paid 24.80 for 10 postcards and 15 envelopes. what is cost of each envelope?

Asmall business produces and sells balls. the fixed costs are $20 and each ball costs $4.32 to produce. each ball sells for $8.32. write the equations for the total cost, c, and the revenue, r, then use the graphing method to determine how many balls must be sold to break even.