What is the circumference of a circle, radius 8cm

What is the length of the segment joining the points at (4,5) and (6,-2) round to the nearest tenth if necessary

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.

Can someone check if i did this correct. it’s number 4 if you’re wondering.