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?

answer: the answer is simply nothing.

step-by-step explanation: because there is no ending to this question

gimme brainliest > : 3

do it yourself this is easy

step-by-step explanation:

system of linear equation

step-by-step explanation:

as given in the data

a= 20 , b= -12

let us suppose that it is a straight line equation

now we know the formula for the system of linear equation

b= ma + c )

here m is slope of a straight line which is equal to formula

m=   (ii)

and here c is a constant

now putting the value of a and b in equation (ii)

m=

m=

putting the value of a,b and m in equation (i) gives us

-12 = + c

-12=-12 + c

adding 12 to both sides

-12 +12 = -12 +12 +c

0 =c

or c=0

as the value of the constant is zero which gives us that it is a linear equation and this order pair satisfies the system of linear equations.