Ineed someone to check my answer. so this problem: -mn is rewrote as -1 . m . n correct? (the dots are in place of multiplication signs.)

12 out of 30 people chose their favourite colour as blue caculate the angle you would use for blue on a pie chart

Divide. –40 ÷ –5 a –8 b 200 c -200 d 8

Ben frank is an electrician who installs lighting fixtures. he charges (in dollars) his clients 15h+40f15h+40f where hh is the number of hours worked and ff is the number of fixtures installed. how much does ben frank charge when he works 77 hours and installs 99 fixtures?