Which property was used to simplify the expression? 3c+ 9 + 4c = 3c + 4c + 9

a: distributive property
b: commutative property
c: associative property
d: inverse property

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.

What is the percentile for data value 6 in the following data set? 4 13 8 6 4 4 13 6 4 13 2 13 15 5 9 4 12 8 6 13 40 25 35 62

2x minus y equals 6, x plus y equals negative 3