Simply each expression by combining like terms.
(3) 4s+8+2d+3s+

(4) 7b+8n-4b-8+n

(5) 15ab-6a+7b-2b

(6) ×+4×+×+4y

Need on this one asap im almost done with this subject

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.

The function f(x) = 14,600(1.1)* represents the population of a town x years after it was established. what was the original population of the town?