You were assigned 10 homework problems. you completed 4 problems. what fraction of assigned problems do you have left?

Given the equation f(x)=a(b)x where the initial value is 40 and the growth rate is 20% what is f(4)

When 142 is added to a number the result is 64 more times the number my options are 35 37 39 41

Liz had 140 pens and inna had 100 pens. after inna gave liz some pens, liz had 3 times as many pens as inna. how many pens did inna give liz?