Add the following algebraic expressions using horizontal method: a) b) c) d) 8-2mn, 10-7mn, and 6 - 15mn Add the following algebrian expression using column method: a) b) c) d) PLS HELP

Consider a graph for the equation y= -3x+4. what is the y intercept? a) 4 b) -4 c) 3 d) -3

Given the choice between receiving $1.000.000 in one month or a single penny-doubled everyday for the period of one month; which option would you choice? show your work to support your answer. (assume that 1 month=30 days)

How do i do this? i don’t understand