I hlp what is 2x+5x A.3
b.4
c.8x
or d x
HELP ASAP

Which of these choices show a pair of equivalent expressions?

For one history test, keith had to answer 40 questions. of these 40 questions, keith answered 28 of them correctly. what percent did keith get on his history test? round your answer to the nearest tenth if necessary

The table above shows approximate conversions from gallons to liters. what is the value of x?