Can some one me with angles and exterior angles stuff

Why is it so easy to buy on impulse and overspend with a credit card? what could you do to counteract this tendency?

Y=21.95x+10 y=22.45x solve by substitution

42. if 20 men can eat 200 kg of wheat in 40 days, then 10 men can eat 300 kg of wheat in how many days? a) 120 days b) 60 days c) 80 days d) none of these