Part A) The table doesn't represent y as a function of x. Why? <span>One reason is that 1 or 3 is the first element in more than one ordered pair. Part B) f(x) = 10x + 20 f(120)= 10*120 + 20 = 1200 + 20 = 1220 </span><span>f(120) represents cost of boating for 120 hours.</span><span> </span>
We want to find out how many calories are in a serving so, 1120/7 = 160. A single serving has 160 calories. 140 calories would be 140/160 = 87.5% of a serving or less than a serving.