Step-by-step explanation: Each session means we are multiplying so we can eliminate B and C so next we must understand where to place our variables. If it is 18 per session then 18s would be the equation and equal the total cost (c) soo the answer is c=18s
The formula for average velocity between two times t1 and t2 of the position function f(x) is (f(t2)-f(t1)) / (t2-t1) Plugging the values in for the first time period we get (f(2.5)-f(2)) / (2.5-2) => (f(2.5)-f(2)) / 0.5 f(2) will be the same for all 4 time periods and is 48(2)-16(2)^2 = 32 Now we plugin the other values f(2.5) = 48(2.5)-16(2.5)^2 = 20 f(2.1) = 48(2.1)-16(2.1)^2 = 30.25 etc. f(2.05) = 31.16 f(2.01) = 31.8384 Now plug these values into the formula (20-32)/0.5 = -24 (30.25-32)/0.1 = -17.5 etc. = -16.8 = -16.16 Final answer: 2.5s => -24 ft/s 2.1s => -17.5 ft/s 2.05 => -16.8 ft/s 2.01 => -16.16 ft/s Hope I helped :)