Question dow below thanks

Which value of m will create a system of parallel lines with no solution? y= mx - 6 8x - 4y = 12

Which of the following pair(s) of circles have las a common external tangent? select all that apply. a and b a and c b and c

Noel is hoping to make a profit (in $) on the school play and has determined the function describing the profit to be f(t) = 8t – 2654, where t is the number of tickets sold. what does the number 8 tell you?