Atoy store mark's up its prices by 45% . what will be the price of a doll that the toy store bought for $12

Add the two expressions 3.8b - 7 and 2.9b + 9 enter your answer in simplified form

The number of branches on a tree demonstrates the fibonacci sequence. how many branches would there be on the next two levels of this tree? 13 | | | m branches

Afarm that has 4 x 10^2 acres has 1.2 x 10^5 cattle. what is the average number of cattle per acre? write the answer in scientific notation. answere asap