How many solutions does the equation 3x-2(x+10)=x-20

One of the inventors of integrated circuits observed that the number of transistors that fit on an integrated circuit will double every 24 months. what type of relationship most appropriately models this situation?

Multiply. write your answer in simplest form. 3/8 x 5/7

The holiday party will cost $160 if 8 people attend.if there are 40 people who attend the party, how much will the holiday party cost