Simplify the expression by combining like terms. 3xy-2x+4-6yx+3x

Can someone me with #s 8, 9, and 11. with just one of the three also works. prove using only trig identities.

Andy has $310 in his account. each week, w, he withdraws $30 for his expenses. which expression could be used if he wanted to find out how much money he had left after 8 weeks?

Aline passes through the points (5,4) and (2.1). part a.) what is the slope of the line that passes through these points? show work. part b.) what is the equation of the line that passes through these points. show work. part c.) where does the line intercept on the x& y axis? show work