Please help me in it! It's very difficult, i'm in 6th and I still don't understand this. Please, help me in this!!!

Simplify 15(x - 4)(x -1)-3(x + 4)(x - 1) with steps

As a self-employed seamstress, you know that it takes 7 yards of material to make 3 jackets. you bought 15 yards of material to make 7 jackets. did you buy enough material? if not, how much were you over or under?

In 1995 america online had about 3000000 users over the next decade users are expected to increase from a few million to the tens of millions suppose the number of users increased by 150% by the year 2000 how many users will there be in the year 2000