Ryan spent $26.33 on 8 gallons of gas how much would he spend for 20 gallons

Can someone check if i did this right since i really want to make sure it’s correct. if you do you so much

Sam is a waiter at a local restaurant where he earns wages of $5 per hour sam figures that he also eams about $3 in tips for each person he serves sam works 6 hours on a particular day. if n represents the number of people sam serves that day, which of the following functions could sam use to figure ehis total earings for the do o a. en) = 30 o b. en) = 5n+ 18

Which statement best describes how to determine whether f(x) = x squared- x +8 is an even function ?