Could I get help solving some of these you don't need to do all of them but I need help lol I'm dum #1. 28−2(8x4)

#2. Jake answered
24/30 questions correctly on his math test.
What is his grade as a percent?

#3. A racecar circled a track 7 times in 20 minutes.
At that rate, how many times did it circle the track in 1 hour?

#4. Reid asked 30 sixth-graders if they owned dogs or cats.
Of the 30 students asked, 20 responded that they own dogs.
If Reid asks all of the 270 sixth-graders at his school the same question, about how many of them can be expected to say they own dogs?