What is 20-7x=6x

Please help

Which expression is equivalent to 2x^2+7x+4?

Which inequality comparing two of the expressions is true when 0.7 < x < 0.9

Marco has $38.43 dollars in his checking account. his checking account is linked to his amazon music account so he can buy music. the songs he purchases cost $1.29. part 1: write an expression to describe the amount of money in his checking account in relationship to the number of songs he purchases. part 2: describe what the variable represents in this situation.