Two thirds of a number is no more than -10

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.

You have 138.72 in your saving account u take out 45.23 and 18.00 you deposit 75.85 into your account

Let f(x) = 5/x and g(x)=2x2+5x. what two numbers are not in the domain of f o g